A paper by Dr. Takashi Oshio, Dr. Ruru Ping and Dr. Ayako Honda titled "Trends in income-related concentration and inequality in health in Japan: evidence from population-based National surveys from 2001 to 2022” has just published in “Population Health Metrics”
 
Oshio, T., Ping, R. & Honda, A. Trends in income-related concentration and inequality in health in Japan: evidence from population-based National surveys from 2001 to 2022. Popul Health Metrics (2025). https://doi.org/10.1186/s12963-025-00443-4