1. a Department of Mathematics , State University of New York College at Buffalo , Buffalo, New York, USA
2. b School of Medicine and Biomedical Sciences , State University of New York at Buffalo , Buffalo, New York, USA
3. c Department of Epidemiology, Division of Cancer Prevention and Population Sciences , Roswell Park Cancer Institute , Buffalo, New York, USA
4. d Ronald Erwin McNair Post-Baccalaureate Achievement Program, State University of New York College at Buffalo , Buffalo, New York, USA
5. e Department of Social and Preventive Medicine, School of Public Health and Health Professions , State University of New York at Buffalo , Buffalo, New York, USA