1. Department of Dental Hygiene, Baekseok University, Cheonan 31065, Korea.
2. Big Data Statistics Institute, Cheonan 31065, Korea.
3. Department of Rehabilitation Medicine, Green Hospital, Seoul 02221, Korea.
4. Graduate School, Yonsei University College of Medicine, Seoul 03722, Korea.
5. Department of Dental Hygiene, Dongnam Health University, Suwon 16328, Korea.