Designing Clinical Research: An Epidemiologic Approach: Cummings, Steven R., Browner, Warren S., M.D., Grady, Deborah G., M.D., Hearst, Norman, Newman, Thomas B., M.D., Hulley, Stephen B., Hulley, Stephen B.: 9780781722186: Amazon.com: Books,Designing Clinical Research,Basics of study design: Practical considerations | Cleveland Clinic Journal of Medicine,Designing Clinical Research - Google Books,Study designs and research methodology in the field of otolaryngology | The Egyptian Journal of Otolaryngology | Full Text