Leng Leng Thang1,2, Wei-Jun Jean Yeung3,4,5. 1. Department of Japanese Studies, National University of Singapore, Blk AS8, Level 5, 10, Kent Ridge Crescent, Singapore, 119260, Singapore. lengthang@nus.edu.sg. 2. Center for Family and Population Research, National University of Singapore, Singapore, 117570, Singapore. lengthang@nus.edu.sg. 3. Department of Sociology, National University of Singapore, AS1, 04-16, 11 Arts Link, Singapore, 117573, Singapore. 4. Center for Family and Population Research, National University of Singapore, Singapore, 117570, Singapore. 5. Asia Research Institute, National University of Singapore, Singapore, 119260, Singapore.