1. Division of Social Science, The Hong Kong University of Science and Technology, Hong Kong SAR, People’s Republic of China
2. Russian Presidential Academy of National Economy and Public Administration Prospekt Vernadskogo, Moskva, Russia
3. World Population Program, International Institute for Applied Systems Analysis, Laxenburg, Austria
4. Laboratory on Demography and Human Capital, Russian Presidential Academy of National Economy and Public Administration, Moskva, Russia