1. School of International Business, Xiamen University Tan Kah Kee College, Zhangzhou, 363105, China
2. Department of Public Health and Clinical Medicine, Section of Sustainable Health, Umeå University, SE-90187 Umeå, Sweden
3. Heidelberg Institute of Public Health, Im Neuenheimer Feld 130/3, 69120 Heidelberg, Germany
4. Department of Epidemiology and Global Health, Umeå University, SE-90187 Umeå, Sweden