West Jane, Kelly Brian, Collings Paul J, Santorelli Gillian, Mason Dan, Wright John
Bradford Institute for Health Research, Bradford Royal Infirmary, Duckworth Lane, Bradford, BD9 6RJ, UK.
School of Social & Community Medicine, University of Bristol, Bristol, UK.
BMC Pediatr. 2018 Feb 1;18(1):22. doi: 10.1186/s12887-018-0987-0.