Jia He1, Zhichao Jin, Danghui Yu. 1. Department of Health Statistics, Faculty of Health Service, Second Military Medical University, Shanghai, 200433, China. hejia63@yahoo.com
Authors: Markus J Steiner; Laureen M Lopez; David A Grimes; Linan Cheng; Jim Shelton; James Trussell; Timothy M M Farley; Laneta Dorflinger Journal: Contraception Date: 2009-12-05 Impact factor: 3.375