PT - JOURNAL ARTICLE AU - Chris Smith TI - Improving the evidence base for digital health interventions to increase contraception use AID - 10.1136/bmjhci-2021-100346 DP - 2021 Apr 01 TA - BMJ Health & Care Informatics PG - e100346 VI - 28 IP - 1 4099 - http://informatics.bmj.com/content/28/1/e100346.short 4100 - http://informatics.bmj.com/content/28/1/e100346.full SO - BMJ Health Care Inform2021 Apr 01; 28