1. Department of Public Health, Biostatistics Consulting Center, College of Medicine, Chang Gung University, Taoyuan, Taiwan
2. Department of Hematology and Oncology, Chang Gung Memorial Hospital, Chiayi, Taiwan
3. Department of Otolaryngology & Head and Neck Surgery, Chang Gung Memorial Hospital, Linkou, Taiwan
4. Division of Hematology and Oncology, Department of Internal Medicine, Taipei Medical University Hospital, and School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan