1. School of Medicine, California University of Science and Medicine, Colton, CA 92324, USA
2. Department of Medicine, Arrowhead Regional Medical Center, California University of Science and Medicine, Colton, CA 92324, USA
3. Department of Surgery, Arrowhead Regional Medical Center, Colton, CA 92324, USA
4. Division of Surgical Oncology, Department of Surgery, Arrowhead Regional Cancer Center, California University of Science and Medicine, Colton, CA 92324, USA