1. Division of Infectious Diseases, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
2. Department of Microbiology, Heilongjiang Provincial Key Laboratory for Infection and Immunity, Harbin Medical University, Harbin, China
3. Far Eastern Memorial Hospital, Taipei, Taiwan
4. Biological Research Laboratories, Daiichi Sankyo Co. Ltd., Tokyo, Japan
5. Lahey Hospital and Medical Center, Burlington, Massachusetts, USA