Four different study designs to evaluate vaccine safety were equally validated with contrasting limitations.
Glanz JM, McClure DL, Xu S, Hambidge SJ, Lee M, Kolczak MS, Kleinman K, Mullooly JP, France EK. Four different study designs to evaluate vaccine safety were equally validated with contrasting limitations. J Clin Epidemiol. 2006 Aug; 59(8):808-18.