[1] Southwest Univ, Coll Phys Educ, Chongqing 400715, Peoples R China
[2] Krirk Univ, Int Coll, Bangkok 10220, Thailand
[3] Orebro Univ, Fac Med & Hlth, Sch Med Sci, Clin Epidemiol & Biostat, S-70182 Orebro, Sweden
[4] Karolinska Inst, Inst Environm Med, Unit Integrat Epidemiol, S-17177 Stockholm, Sweden