Institute of Social Medicine and Family Medicine;
Zhejiang University;
Hangzhou 310058;
China;
Department of Medical Psychology and Medical Sociology;
University of Goettingen;
Goettingen 37073;
Germany;
Scientific IT Consulting;
Duderstadt 37115;
Germany;
Institute for Informatics;
University of Goettingen;
Goettingen 37083;
Germany;