Layton JB, Li D, Meier CR, Sharpless JL, Sturmer T, Brookhart MA. Injection testosterone and adverse cardiovascular events: a case-crossover analysis. Clin Endocrinol (Oxf). 2018 May;88(5):719-27. doi: 10.1111/cen.13574
Lawson DH, Jick H, Rothman KJ. Coffee and tea consumption and breast disease. Surgery. 1981 Jan 1;90(5):801-3.