PT - JOURNAL ARTICLE AU - Yoshitomo Saita TI - Risk/caution of vitamin D insufficiency for quarantined athletes returning to play after COVID-19 AID - 10.1136/bmjsem-2020-000882 DP - 2020 Oct 01 TA - BMJ Open Sport & Exercise Medicine PG - e000882 VI - 6 IP - 1 4099 - http://bmjopensem.bmj.com/content/6/1/e000882.short 4100 - http://bmjopensem.bmj.com/content/6/1/e000882.full SO - BMJ OPEN SP EX MED2020 Oct 01; 6