1. Graduate School of Informatics Nagoya University Furo‐cho, Chikusa‐ku Nagoya Aichi 464‐8601 Japan
2. Department of Gastroenterology Kyoto Second Red Cross Hospital 355‐5, Haruobi‐cho, Kamigyo‐ku Kyoto Kyoto 602‐8026 Japan
3. Department of Respiratory Medicine Sapporo‐Minami‐Sanjo Hospital Nishi‐6‐chome, Minami‐3‐jo, Chuo‐ku Sapporo Hokkaido 060‐0063 Japan
4. Department of Respiratory Medicine Sapporo‐Kosei General Hospital Higashi‐8‐chome, Kita‐3‐jo, Chuo‐ku Sapporo Hokkaido 060‐0033 Japan
5. Department of Respiratory Medicine Keiwakai Nishioka Hospital 1‐52, 4‐jo 4‐chome, Nishioka, Toyohira‐ku Sapporo Hokkaido 062‐0034 Japan
6. Research Center for Medical Bigdata National Institute of Informatics 2‐1‐2 Hitotsubashi Chiyoda‐ku Tokyo 101‐8430 Japan