1. Department of Medical Bioscience; University of the Western Cape; Bellville 7535 South Africa
2. Shenyang Center for Disease Control and Prevention; Shenyang China
3. Department of Sport, Recreation and Exercise Science; University of the Western Cape; Bellville 7535 South Africa
4. Liaoning Sport Science Institute; Shenyang China
5. Wellmen Clinic; Damai Service Hospital; Kuala Lumpur 52100 Malaysia