1. Kangnam Sacred Heart Hospital, College of Medicine, Hallym University, Seoul, South Korea
2. Dongtan Sacred Heart Hospital, College of Medicine, Hallym University, Hwaseong, South Korea
3. Department of Statistics, Soonchunhyang University Bucheon Hospital, Bucheon, South Korea
4. Hallym University Sacred Heart Hospital, College of Medicine, Hallym University, Anyang, South Korea