Tamoxifen and the endometrium: findings of pelvic ultrasound examination and endometrial biopsy in asymptomatic breast cancer patients. - Bertelli,G.; Venturini,M.; Del Mastro,L.; Garrone,O.; Cosso,M.; Gustavino,C.; Cusimano,E.; Guido,T.; Nicolo,G.; Rosso,R. (Breast Cancer Res Treat, 1998)