A comparison of observational studies and randomized, controlled trials

• 1 November 2000
• journal article
• Published by Elsevier in American Journal of Ophthalmology
• Vol. 130  (5) , 688
• https://doi.org/10.1016/s0002-9394(00)00754-6

Abstract

Keywords

• OBSERVATIONAL STUDIES
• CONTROLLED TRIALS
• COMPARISON OF OBSERVATIONAL
• STUDIES AND RANDOMIZED