Additional file 2: of Board certification and urban–rural migration of physicians in Japan KoikeSoichi MatsumotoMasatoshi KawaguchiHideaki IdeHiroo AtarashiHidenao KotaniKazuhiko YasunagaHideo 2018 Odds of migrating to more rural areas for newly certified physicians working in second tertile areas in 2012 (sub-analysis of the individual specialties). (PDF 49 kb)