1. Department of Internal Medicine, Larkin Community Hospital, South Miami, Florida, USA
2. Department of Medicine, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
3. Department of Internal Medicine, Division of Oncology and Hematology, University of Nebraska Medical Center, Omaha, NE, USA
4. Department of Health Sciences, Division of Quantitative Health Sciences, Mayo Clinic, Rochester, MN, USA