1. M. Ataharul-Islam:
Department of Statistics and OR, King Saud University, PO Box 2455, Riyadh 11451, Saudi Arabia
2. Rafiqul I Chowdhury:
Department of Epidemiology and Biostatistics, University of Western Ontario, Canada
3. Karan P. Singh:
Department of Medicine, Division of Preventive Medicine, University of Alabama at Birmingham, Birmingham, Alabama