From the Division of Infectious Diseases, Department of Medicine, Phramongkutklao Hospital, Bangkok, Thailand.

Correspondence to: Worawong Chueansuwan, MD, Division of Infectious Diseases, Department of Medicine, Phramongkutklao Hospital, 315 Ratchawithi Road, Ratchathewi District, Bangkok 10400, Thailand. E-mail: [email protected]

The authors have no funding or conflicts of interest to disclose.