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 Medicine, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, USA
4. Department of Internal Medicine, Einstein Medical Center, Philadelphia, Pennsylvania, USA
5. Department of Internal Medicine, Griffin Hospital, Derby, Connecticut, USA
6. Department of Internal Medicine, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
7. Hematology and Oncology Department, Texas Tech University Health Sciences Center, Lubbock, Texas, USA