Department of Statistics, Nanjing University of Finance and Economics, Nanjing, China, School of Statistics and Management, Shanghai University of Finance and Economics, Shanghai, China.|Department of Biostatistics, Yale University, New Haven, CT, USA.|Department of Statistics and Actuarial Science, University of Iowa, Iowa, IA, USA.|Department of Clinical Science, The University of Texas Southwestern Medical Center, Dallas, TX, USA and.|Department of Biostatistics, Yale University, New Haven, CT, USA, VA Cooperative Studies Program Coordinating Center, West Haven, CT, USA.