Published in CMAJ on July 27, 1999
Oral vitamin B12 versus intramuscular vitamin B12 for vitamin B12 deficiency. Cochrane Database Syst Rev (2005) 2.57
Effects of chemical and physical enhancement techniques on transdermal delivery of cyanocobalamin (vitamin B12) in vitro. Pharmaceutics (2011) 0.77
Successful sublingual cobalamin treatment in a child with short-bowel syndrome. J Pediatr Pharmacol Ther (2014) 0.75
Sensory Neuronopathy Revealing Severe Vitamin B12 Deficiency in a Patient with Anorexia Nervosa: An Often-Forgotten Reversible Cause. Nutrients (2017) 0.75
Vitamin B12 injections for the elderly. CMAJ (2000) 0.75
Prevalence of vitamin B12 deficiency among geriatric outpatients. J Fam Pract (1992) 3.52
Oral cobalamin for pernicious anemia. Medicine's best kept secret? JAMA (1991) 3.39
Clinical spectrum and diagnosis of cobalamin deficiency. Blood (1990) 3.29
Expected and observed values for the prescription of vitamin B 12 in England and Wales. Br J Prev Soc Med (1971) 3.27
Prevalence of cobalamin deficiency in the Framingham elderly population. Am J Clin Nutr (1994) 3.08
Elevated methylmalonic acid and total homocysteine levels show high prevalence of vitamin B12 deficiency after gastric surgery. Ann Intern Med (1996) 2.19
Metabolic evidence that deficiencies of vitamin B-12 (cobalamin), folate, and vitamin B-6 occur commonly in elderly people. Am J Clin Nutr (1993) 1.98
Prevalence of undiagnosed pernicious anemia in the elderly. Arch Intern Med (1996) 1.71
Cobalamin, the stomach, and aging. Am J Clin Nutr (1997) 1.46
Use of vitamin B-12 in Leicestershire practices: a single topic audit led by a medical audit advisory group. BMJ (1995) 1.37
Audit of the use of vitamin B12 in general practice. Br Med J (Clin Res Ed) (1983) 1.21
Serum vitamin B12 levels in the aged. Acta Med Scand (1976) 1.00
Performance of the serum cobalamin assay for diagnosis of cobalamin deficiency. Am J Med Sci (1994) 0.95
Characteristics of non-cobalamin deficient patients who receive regular cyanocobalamin injections. Fam Med (1991) 0.85
Simple confidence intervals for standardized rates based on the approximate bootstrap method. Stat Med (1995) 0.83
Physician response to low serum cobalamin levels. Arch Intern Med (1986) 0.81
Effects of socioeconomic status on access to invasive cardiac procedures and on mortality after acute myocardial infarction. N Engl J Med (1999) 7.68
Use of medical resources and quality of life after acute myocardial infarction in Canada and the United States. N Engl J Med (1994) 6.78
Users' guides to the medical literature: XXII: how to use articles about clinical decision rules. Evidence-Based Medicine Working Group. JAMA (2000) 5.94
Users' guides to the medical literature. XII. How to use articles about health-related quality of life. Evidence-Based Medicine Working Group. JAMA (1997) 5.07
Incorporating variations in the quality of individual randomized trials into meta-analysis. J Clin Epidemiol (1992) 4.86
Use of cardiac procedures and outcomes in elderly patients with myocardial infarction in the United States and Canada. N Engl J Med (1997) 4.84
How should health status measures be assessed? Cautionary notes on procrustean frameworks. J Clin Epidemiol (1992) 4.54
Meta-analysis and the meta-epidemiology of clinical research. BMJ (1997) 4.07
Do we know what inappropriate laboratory utilization is? A systematic review of laboratory clinical audits. JAMA (1998) 3.96
Cost effectiveness of thrombolytic therapy with tissue plasminogen activator as compared with streptokinase for acute myocardial infarction. N Engl J Med (1995) 3.69
Effect of alpha-interferon treatment in patients with hepatitis B e antigen-positive chronic hepatitis B. A meta-analysis. Ann Intern Med (1993) 3.53
Communicating the benefits of chronic preventive therapy: does the format of efficacy data determine patients' acceptance of treatment? Med Decis Making (1995) 3.21
Impact of increasing carbohydrate intolerance on maternal-fetal outcomes in 3637 women without gestational diabetes. The Toronto Tri-Hospital Gestational Diabetes Project. Am J Obstet Gynecol (1995) 3.05
Multicenter validation of a risk index for mortality, intensive care unit stay, and overall hospital length of stay after cardiac surgery. Steering Committee of the Provincial Adult Cardiac Care Network of Ontario. Circulation (1995) 3.02
Variation in breast cancer surgery in Ontario. CMAJ (1994) 2.70
Ready-made, recalibrated, or Remodeled? Issues in the use of risk indexes for assessing mortality after coronary artery bypass graft surgery. Circulation (1999) 2.67
Comparison of an aggressive (U.S.) and a less aggressive (Canadian) policy for cholesterol screening and treatment. Ann Intern Med (1991) 2.61
Multicentre trial to introduce the Ottawa ankle rules for use of radiography in acute ankle injuries. Multicentre Ankle Rule Study Group. BMJ (1995) 2.50
Reflections on a month in the life of the Ontario Drug Benefit Plan. CMAJ (1994) 2.20
Characteristics and mortality outcomes of thrombolysis trial participants and nonparticipants: a population-based comparison. J Am Coll Cardiol (1996) 2.09
Temporal changes in the outcomes of acute myocardial infarction in Ontario, 1992-1996. CMAJ (1999) 2.04
What is appropriate care? N Engl J Med (1998) 1.97
Diagnostic accuracy and short-term surgical outcomes in cases of suspected acute appendicitis. CMAJ (1995) 1.91
Coronary artery bypass graft surgery in Ontario and New York State: which rate is right? Steering Committee of the Cardiac Care Network of Ontario. Ann Intern Med (1997) 1.89
False-positive coding for acute myocardial infarction on hospital discharge records: chart audit results from a tertiary centre. Can J Cardiol (1990) 1.87
Fairness in the coronary angiography queue. CMAJ (1999) 1.83
Long-term MI outcomes at hospitals with or without on-site revascularization. JAMA (2001) 1.66
A survey of provider experiences and perceptions of preferential access to cardiovascular care in Ontario, Canada. Ann Intern Med (1998) 1.66
Coronary artery bypass mortality rates in Ontario. A Canadian approach to quality assurance in cardiac surgery. Steering Committee of the Provincial Adult Cardiac Care Network of Ontario. Circulation (1996) 1.61
Appropriateness of primary total hip and knee replacements in regions of Ontario with high and low utilization rates. CMAJ (1996) 1.56
The burden of waiting for hip and knee replacements in Ontario. Ontario Hip and Knee Replacement Project Team. J Eval Clin Pract (1997) 1.53
Potential cost effectiveness of intravenous tissue plasminogen activator versus streptokinase for acute myocardial infarction. Can J Cardiol (1992) 1.52
Dealing with missing data in observational health care outcome analyses. J Clin Epidemiol (2000) 1.49
The relationship between cardiac functional capacity and patients' symptom-specific utilities for angina: some findings and methodologic lessons. Med Decis Making (1996) 1.41
Trends in clinical and economic outcomes of coronary angioplasty from 1992 to 1995: a population-based analysis. Am Heart J (1999) 1.39
Assessing the outcomes of coronary artery bypass graft surgery: how many risk factors are enough? Steering Committee of the Cardiac Care Network of Ontario. J Am Coll Cardiol (1997) 1.39
In the queue for total joint replacement: patients' perspectives on waiting times. Ontario Hip and Knee Replacement Project Team. J Eval Clin Pract (1998) 1.37
Comparison of the appropriateness of coronary angiography and coronary artery bypass graft surgery between Canada and New York State. JAMA (1994) 1.35
Biology or bias: practice patterns and long-term outcomes for men and women with acute myocardial infarction. J Am Coll Cardiol (2002) 1.35
Health services research: reporting on studies using secondary data sources. CMAJ (1996) 1.35
Fifteen-year trends in risk severity and operative mortality in elderly patients undergoing coronary artery bypass graft surgery. Circulation (1998) 1.32
No impact from active dissemination of the Ottawa Ankle Rules: further evidence of the need for local implementation of practice guidelines. CMAJ (1999) 1.30
A comparison of a Bayesian vs. a frequentist method for profiling hospital performance. J Eval Clin Pract (2001) 1.29
Triiodothyronine augmentation in the treatment of refractory depression. A meta-analysis. Arch Gen Psychiatry (1996) 1.26
Postmenopausal estrogen replacement therapy and increased rates of cholecystectomy and appendectomy. CMAJ (2000) 1.25
Prescribing propensity: influence of life-expectancy gains and drug costs. J Gen Intern Med (1994) 1.24
Self-perceived health status of women three to five years after the diagnosis of gestational diabetes: a survey of cases and matched controls. Am J Obstet Gynecol (1998) 1.24
Better care and better outcomes: the continuing challenge. JAMA (1998) 1.23
Vitamin B12 injections versus oral supplements. How much money could be saved by switching from injections to pills? Can Fam Physician (2001) 1.22
Will elderly patients stand aside for younger patients in the queue for cardiac services? Lancet (1999) 1.21
Subgroups, treatment effects, and baseline risks: some lessons from major cardiovascular trials. Am Heart J (2000) 1.20
Trends in coronary artery bypass grafting in Ontario from 1981 to 1989. CMAJ (1993) 1.20
Mismatch of coronary risk and treatment intensity under the National Cholesterol Education Program guidelines. J Gen Intern Med (1992) 1.17
Are the marginal returns of coronary artery surgery smaller in high-rate areas? The Steering Committee of the Provincial Adult Cardiac Care Network of Ontario. Lancet (1996) 1.17
The Toronto Tri-Hospital Gestational Diabetes Project. A preliminary review. Diabetes Care (1998) 1.14
Aspirin and fibrinolysis in acute myocardial infarction: meta-analytic evidence for synergy. J Clin Epidemiol (1991) 1.13
Using a trade-off technique to assess patients' treatment preferences for benign prostatic hyperplasia. Med Decis Making (1996) 1.13
Sex differences in the use of invasive coronary procedures in Ontario. Can J Cardiol (1994) 1.12
Health care in Canada: incrementalism under fiscal duress. Health Aff (Millwood) (1999) 1.10
Reporting medical mistakes and misconduct. CMAJ (1999) 1.09
Organized medicine and the assessment of technology. Lessons from Ontario. N Engl J Med (1990) 1.08
The Canadian Cardiovascular Society grading scale for angina pectoris: is it time for refinements? Ann Intern Med (1992) 1.08
The HIV-specific advance directive. J Gen Intern Med (1997) 1.07
Variation in hospital length of stay for acute myocardial infarction in Ontario, Canada. Med Care (1994) 1.06
A predictive index for length of stay in the intensive care unit following cardiac surgery. CMAJ (1994) 1.04
Towards improved coding of acute myocardial infarction in hospital discharge abstracts: a pilot project. Can J Cardiol (1997) 1.04
Rates of cardiac catheterization, coronary angioplasty and coronary artery bypass surgery in Canada. Can J Cardiol (1997) 1.04
Life-sustaining treatment preferences of hemodialysis patients: implications for advance directives. J Am Soc Nephrol (1995) 1.02
Rating the urgency of coronary angiography: results of an expert panel process. Ontario Coronary Angiography Panel. Can J Cardiol (1993) 1.02
Coronary revascularization after thrombolytic therapy for myocardial infarction: what caseloads could Canadian centres face? CMAJ (1989) 1.01
Temporal trends in breast cancer surgery in Ontario: can one randomized trial make a difference? CMAJ (1994) 1.00
Pitfalls in nonrandomized outcomes studies. The case of incidental appendectomy with open cholecystectomy. JAMA (1995) 0.99
Regionalized delivery and variable utilization of coronary artery bypass grafting in Ontario from 1981 to 1991. CMAJ (1994) 0.99
Central-nervous-system dysfunction after warm or hypothermic cardiopulmonary bypass. Lancet (1992) 0.98
Hospital volume, calendar age, and short term outcomes in patients undergoing repair of abdominal aortic aneurysms: the Ontario experience, 1988-92. J Epidemiol Community Health (1996) 0.98
Effect of coronary artery bypass graft surgery on survival. Lancet (1994) 0.97
Eating for two: are guidelines for weight gain during pregnancy too liberal? Lancet (1998) 0.97
Breast cancer patients' attitudes about rationing postlumpectomy radiation therapy: applicability of trade-off methods to policy-making. J Clin Oncol (1997) 0.97
Metaanalysis of prophylactic drug treatment in the prevention of postoperative bleeding. Ann Thorac Surg (1994) 0.96
Optimal antithrombotic therapy following aortocoronary bypass: a meta-analysis. Eur J Cardiothorac Surg (1993) 0.96
Impact of preoperative risk and perioperative morbidity on ICU stay following coronary bypass surgery. Cardiovasc Surg (1996) 0.94
Case selection and appropriateness of coronary angiography and coronary artery bypass graft surgery in British Columbia and Ontario. Can J Cardiol (1997) 0.94
Cardiopulmonary bypass, temperature, and central nervous system dysfunction. Circulation (1994) 0.94
Parkinsonism in Ontario: increased mortality compared with controls in a large cohort study. Neurology (2001) 0.93
Fish oil in lupus nephritis: clinical findings and methodological implications. Kidney Int (1993) 0.92
Impact of time since last meal on the gestational glucose challenge test. The Toronto Tri-Hospital Gestational Diabetes Project. Am J Obstet Gynecol (1994) 0.92
Revascularization after acute myocardial infarction: impact of hospital teaching status and on-site invasive facilities. J Gen Intern Med (1994) 0.90
Integrated delivery systems: has their time come in Canada? CMAJ (1996) 0.90
Clinical prediction rules. J Clin Epidemiol (1997) 0.89
Drug prices and third party payment: do they influence medication selection? Pharmacoeconomics (1994) 0.89
Rate of heart failure and 1-year survival for older people receiving low-dose beta-blocker therapy after myocardial infarction. Lancet (2000) 0.89
Coronary angiography and bypass surgery in Manitoba and the United States: a first comparison. Can J Cardiol (1994) 0.88
Users' guides to the medical literature: XXIV. How to use an article on the clinical manifestations of disease. Evidence-Based Medicine Working Group. JAMA (2000) 0.88
Should there be early publication of ancillary studies prior to the first primary report of an unblinded randomized clinical trial? J Clin Epidemiol (1993) 0.87
Benchmarking the provision of coronary artery surgery. CMAJ (1998) 0.87
Parkinsonism in Ontario: physician utilization. Can J Neurol Sci (2002) 0.87