Challenges of maternity continuum of care within the primary health care in northwest Ethiopia: interpretive description using a socio-ecological model - Mihret, Muhabaw Shumye; Alemu, Kassahun; Beshah, Debrework Tesgera; Gezie, Lemma Derseh; Erlandsson, Kerstin; Lindgren, Helena (Frontiers in Public Health, 2024)