Supplemental material, sj-doc-2-smo-10.1177_20503121231153508 for Systematic review and meta-analysis protocol for development and validation of a prediction model for gestational hypertension in Africa by Sefineh Fenta Feleke, Anteneh Mengist Dessie, Denekew Tenaw, Ali Yimer, Habtamu Geremew, Rahel Mulatie and Abayneh Kebede in SAGE Open Medicine