1. College of Physical Education, Southwest University, Chongqing 400715, China
2. International College, Krirk University, Bangkok 10220, Thailand
3. Clinical Epidemiology and Biostatistics, School of Medical Sciences, Faculty of Medicine and Health, Orebro University, 70182 Orebro, Sweden
4. Unit of Integrative Epidemiology, Institute of Environmental Medicine, Karolinska Institutet, 17177 Stockholm, Sweden