1. Department of Clinical Laboratory, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing 100730, People's Republic of China
2. Graduate School, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100730, People's Republic of China
3. AstraZeneca Pharmaceuticals LP, Waltham, Massachusetts 02451
4. Chinese Center for Disease Control and Prevention, Beijing 102206, People's Republic of China
5. National Institute for the Control of Pharmaceutical and Biological Products, Beijing 100050, People's Republic of China