AU - Hammill B FAU - Hammill, Bradley G. AU - Lopes R FAU - Lopes, Renato D. AU - Harrington R FAU - Harrington, Robert A. TI - Chapter 12. Observational Study Designs PT - BOOK SECTION DP - 2013 BTI - Understanding Clinical Research DA - 2013 Y2 - 2024/12/04 UR - accessbiomedicalscience.mhmedical.com/content.aspx?aid=57836443