Cole JA, Rothman KJ, Cabral HJ, Zhang Y, Farraye FA. Incidence of IBS in a cohort of people with asthma. Dig Dis Sci. 2007 Feb 28;52(2):329-35.
Hoogeveen EK, Rothman KJ. Hyperhomocysteinemia increases the risk of death in type 2 diabetes. Cardiovasc Rev Rep. 2001;22:207-12.