1. Institute of Blood Transfusion; Chinese Academy of Medical Sciences; Chengdu P.R. China
2. Johns Hopkins Medical Institutions; Baltimore Maryland
3. Kunming Blood Center; Kunming Yunnan P.R. China
4. Urumqi Blood Center; Urumqi Xinjiang P.R. China
5. Mianyang Blood Center; Mianyang Sichuan P.R.China. Luoyang Blood Center; Luoyang Henan P.R. China. Westat, Inc.; Rockville Maryland