Z. Xia

发表

J. Trussell, H. Peterson, L. Tylor, 1997 .

P. Wingo, S. Ventura, J. Marks, 1997 .

M. Sierra, A. Duerr, M. Macasaet, 1997, Obstetrics and gynecology.

H. Peterson, L. Koonin, H B Peterson, 1994, Obstetrics and gynecology.

H. Lawson, H. Atrash, H W Lawson, 1993, MMWR. CDC surveillance summaries : Morbidity and mortality weekly report. CDC surveillance summaries.

J. Trussell, H. Peterson, L. Tylor, 1996, American journal of obstetrics and gynecology.

J. Trussell, H. Peterson, L. Tylor, 1997, The New England journal of medicine.

J. Trussell, H. Peterson, L. Tylor, 2001, Obstetrics and gynecology.