Department of Biomedical Informatics, University of California, San Diego, CA 92093.|Department of Biomedical Informatics, University of California, San Diego, CA 92093, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.|Department of Biomedical Informatics, University of California, San Diego, CA 92093, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.|Microsoft Research, San Diego, CA 92122, USA.|Seoul National University, Seoul, 151-742, Republic of Korea and.|Department of Electrical Engineering and Computer Science, Syracuse University, Syracuse, NY 13244, USA.|Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.|Department of Biomedical Informatics, University of California, San Diego, CA 92093.