Affiliation: | 1 Division of Biometrics, University of Medicine and Dentistry of New Jersey, 335 George Street, Suite 2200, New Brunswick, New Jersey 08903, U.S.A.jg_liao@yahoo.com 2 Department of Biometry and Epidemiology, Medical University of South Carolina, 135 Rutledge Avenue, Suite 1148, Charleston, South Carolina 29425, U.S.A. lipsitzs@musc.edu |