1. Durham Infancy and Sleep Centre, Department of Anthropology, Durham University, Stockton Road, Durham DH1 3LE, UK
2. School of Social Sciences, Humanities and Law, Teesside University, Borough Road, Middlesbrough TS1 3BX, UK
3. Children’s Department, County Durham and Darlington NHSFT, Chester le Street Hospital, Front Street, Chester le Street DH3 3AT, UK
4. Adult and Health Services, Durham County Council, Room 3/74-75, County Hall, Durham DH1 5UJ, UK