1. Department of Sociology, University of Oxford, 42-43 Park End Street, Oxford OX1 1JD UK ().
2. Department of Sociology, University of Oxford, 42-43 Park End Street, Oxford OX1 1JD, UK ().
3. Facility of Data Science, Rissho University, 4 Chome-2-16 Osaki, Shinagawa City, Tokyo 141-8602, Japan ().
4. National Statistics Center, Statistics Bureau of Japan ().