Epidemiological Study on Contraceptive Knowledge Levels and Related Factors of Migrant Population in Beijing，Shanghai and Chengdu

JI Hong-lei;ZHAO Rui;WU Jun-qing;ZHOU Ying;CHENG Jian-ping;LI Yu-yan;HUANG Ping;LI Yi-ran;CHEN Jia-peng

Journal of International Reproductive Health/Family Planning . 2014, (2): 80 -84 .