1. Division of Infectious Disease, Faculty of Medicine, Thammasat University, Pathum Thani, Thailand
2. Department of Orthopedic Surgery, Thammasat Hospital, Pathum Thani, Thailand
3. Department of Pathology and Forensic Medicine, Thammasat Hospital, Pathum Thani, Thailand
4. Division of Infectious Diseases, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA