1. Department of Gastroenterology, Ajou University School of Medicine, Suwon, Republic of Korea
2. Stomach Cancer Center, Ajou University Hospital, Suwon, Republic of Korea
3. Department of Biomedical Informatics, Ajou University School of Medicine, Suwon, Republic of Korea
4. Office of Biostatistics, Ajou Research Institute for Innovative Medicine, Ajou University Medical Center, Suwon, Republic of Korea
5. Department of Medical Sciences, Biomedical Informatics, Graduate School of Ajou University, Suwon, Republic of Korea
6. Department of Occupational and Environmental Medicine, Ajou University School of Medicine, Suwon, Republic of Korea