1. Department of Biostatistics and Epidemiology, College of Public Health, and
2. Hematology-Oncology Section, Department of Medicine, College of Medicine, The University of Oklahoma Health Sciences Center, Oklahoma City, OK;
3. Department of Hematology and Central Hematology Laboratory, Inselspital, Bern University Hospital, Bern, Switzerland; and
4. Department of Clinical Research, University of Bern, Bern, Switzerland