1. Division of Infectious Disease, Department of Medicine, Buddhist Taipei Tzu Chi General Hospital, Taipei, Taiwan.
2. Division of Infectious Disease, Department of Medicine, Buddhist Tzu Chi General Hospital, Hualien, Taiwan.
3. Division of Infectious Disease, Department of Medicine, Buddhist Dalin Tzu Chi General Hospital, Hualien, Taiwan.
4. School of Medicine, Tzu Chi University, Hualien, Taiwan.