1. School of Information and Data Sciences, Nagasaki University, Nagasaki 852-8521, Japan
2. Tohoku University Graduate School of Medicine, Sendai, Miyagi 980-8575, Japan
3. Statistical Genetics Team, RIKEN Center for Advanced Intelligence Project, Chuo-ku, Tokyo 103-0027, Japan
4. Tohoku Medical Megabank Organization, Tohoku University, Sendai, Miyagi 980-8573, Japan