RT Book, Section A1 Vock, David M. A2 Lopes, Renato D. A2 Harrington, Robert A. SR Print(0) ID 57836530 T1 Chapter 13. Challenges of Observational Designs T2 Understanding Clinical Research YR 2013 FD 2013 PB The McGraw-Hill Companies PP New York, NY SN 978-0-07-174678-6 LK accessbiomedicalscience.mhmedical.com/content.aspx?aid=57836530 RD 2024/03/28 AB Although randomized controlled experiments remain the gold standard for medical research, observational studies—studies in which the researcher does not assign or alter any factor of interest—still play an important role.