1. Division of Biostatistics and Bioinformatics, Institute of Population Health Sciences, National Health Research Institutes, Zhunan 350, Taiwan
2. Department of Bioengineering, University of California—San Diego, 9500 Gilman Dr., La Jolla, California 92093-0412
3. Division of Molecular and Genomic Medicine, National Health Research Institutes, Zhunan 350, Taiwan
4. Institute of Molecular Medicine, National Tsing Hua University, Hsin Chu 30013, Taiwan