1. Department of Medicine, Texas Tech University Health Sciences Center, Lubbock, Texas, USA
2. Department of Internal Medicine, Weiss Memorial Hospital, Chicago, Illinois, USA
3. Department of Internal Medicine, Mahidol University, Bangkok, Thailand
4. Department of Medicine, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, USA
5. Department of Internal Medicine, Einstein Medical Center, Philadelphia, Pennsylvania, USA
6. Hematology and Oncology Department, Texas Tech University Health Sciences Center, Lubbock, Texas, USA