Affiliation: | 1. Department of Statistics, University of South Carolina, Columbia, South Carolina 29208, U.S.A.;2. Department of Mathematical Sciences, Clemson University, Clemson, South Carolina 29634, U.S.A.;3. Department of Biostatistics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, U.S.A.;4. Department of Health Services Policy and Management, University of South Carolina, Columbia, South Carolina 29208, U.S.A. |