1 1 Department of Healthcare Management, Institute of Global Healthcare Research, Eulji University , Seongnam, Korea.
2 2 Global Health Unit, Department of Health Sciences, University Medical Centre Groningen, University of Groningen, Groningen, the Netherlands .
3 3 Department of Biostatistics, Korea University College of Medicine , Seoul, Korea.
4 4 Department of Health Policy and Management, Graduate School of Public Health, Korea University , Seoul, Korea.
5 5 Department of Humanities and Social Medicine, College of Medicine and Catholic Institute for Healthcare Management, The Catholic University of Korea , Seoul, Korea.