Rodes-Cabau J, Horlick E, Ibrahim R, Cheema AN, Labinaz M, Nadeem N, Osten M, Cote M, Marsal JR, Rivest D, Marrero A, Houde C. Effect of clopidogrel and aspirin vs aspirin alone on migraine headaches after transcatheter atrial septal defect closure: the CANOA randomized clinical trial. JAMA. 2015 Nov 24;314(20):2147-54. doi: 10.1001/jama.2015.13919
Milunsky A, Jick H, Jick SS, Bruell CL, MacLaughlin DS, Rothman KJ, Willett W. Multivitamin/folic acid supplementation in early pregnancy reduces the prevalence of neural tube defects. JAMA. 1989 Nov 24;262(20):2847-52. doi: 10.1001/jama.1989.03430200091032