1. Department of Industrial and Management Engineering, Pohang University of Science and Technology, Pohang 37673, Korea;
2. School of Management Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea;
3. Department of Internal Medicine, Yonsei University College of Medicine, Seoul 03722, Korea;
4. Department of Health Policy and Management, Inje University, Gimhae 50834, Korea;
5. Department of Industrial and Management Engineering, Pohang University of Science and Technology, Pohang 37673, Korea