Setting health systems research priorities for Afghanistan: an application of the child health and nutrition research initiative (CHNRI) methodology to set a roadmap to 2030 - David H Peters; Nadia Akseer; Aliki Christou; Hannah Tappis; Hana Tasic; Robert Black; Egbert Sondorp; Emily C Keats; Cyrus Engineer; Shohra Qaderi; Kerri Wazny; Najibullah Safi; et al. (BMJ Global Health)