Groenwold R, Uddin M, Roes K, de Boer A, Rivero-Ferrer E, Martin E, Gatto N, Klungel O. Instrumental variable analysis in randomized trials with non-compliance and observational pharmacoepidemiologic studies. OA Epidemiology. 2014 May 9;2(1):9.
Grogan S, Hartley L, Fry G, Conner M, Gough B. Appearance concerns and smoking in young men and women: going beyond weight control. Drug-Educ Prev Polic. 2010 May 6;17(3):261-9. doi: 10.3109/09687630802422019
Sorensen HT, Steffensen FH, Sabroe S, Rothman KJ, Gillman MW, Fischer P. Historical cohort study of in utero exposure to uterotonic drugs and cognitive function in young adult life. West J Med. 1999 Jan 1;170(5):260-2.