Department of Statistics, Keimyung University, Daegu 42601, South Korea.|Genomics Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.|Department of Biostatistics, University of Pittsburgh, Pittsburgh, PA 15261, USA.|Department of Biostatistics, University of Pittsburgh, Pittsburgh, PA 15261, USA.|Department of Biostatistics, University of Pittsburgh, Pittsburgh, PA 15261, USA.