Martin Vessey

A long-term study of mortality in men who have undergone vasectomy.

F. Speizer, G. Colditz, E. Giovannucci, 1992, The New England journal of medicine.

A retrospective cohort study of vasectomy and prostate cancer in US men.

F. Speizer, G. Colditz, E. Giovannucci, 1993, JAMA.

Incidence of disease after vasectomy: a record linkage retrospective cohort study.

M. Goldacre, V. Seagroatt, L. Gill, 1992, BMJ.