PT - JOURNAL ARTICLE AU - Kurmi, Om P. TI - Is low level of vitamin D a marker of poor health, or a cause? AID - 10.1183/13993003.00931-2018 DP - 2018 Jun 01 TA - European Respiratory Journal PG - 1800931 VI - 51 IP - 6 4099 - http://erj.ersjournals.com/content/51/6/1800931.short 4100 - http://erj.ersjournals.com/content/51/6/1800931.full SO - Eur Respir J2018 Jun 01; 51