1. School of Health Care Management, Shandong University, 44 Wenhuaxi Rd., Jinan, Shandong, P.R. China
2. NHC Key Laboratory of Health Economics and Policy Research (Shandong University), 44 Wenhuaxi Rd., Jinan, Shandong, P.R. China
3. Department of Public Health Sciences, Karolinska Institutet, Tomtebodavägen 18A, Karolinska Institutet, Stockholm, Sweden
4. Zhucheng Center for Disease Control and Prevention, 168 East Huan Rd., Zhucheng, Shandong, P.R. China