1. Department of Psychology, University of Jyvaskyla, P.O. Box 35, Jyväskylä FI-40014, Finland
2. KIHU—Research Institute for Olympic Sports, Rautpohjankatu 6, Jyväskylä 40700, Finland
3. Mehiläinen Sports Medical Clinic, Kauppakatu 35, Jyväskylä 40100, Finland
4. Exercise, Health and Technology Center, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai Dongchuan Road 800, Shanghai 200240, China