Abstract
Smith, GCS
Smith, GCS (reprint author), Univ Cambridge, Rosie Hosp, Dept Obstet & Gynaecol, Box 223, Cambridge CB2 0SW, England.; Smith, GCS (reprint author), Cambridge Comprehens Biomed Res Ctr, Natl Inst Hlth Res, Cambridge, England.
LANCET CHILD & ADOLESCENT HEALTH, 2018; 2 (2): 80