1. Mother and Infant Research Unit, School of Health Sciences; University of Dundee; Dundee UK
2. Breastfeeding Network; Paisley UK
3. Centre for Paediatric Epidemiology and Biostatistics; Institute of Child Health; London UK
4. School of Nursing and Midwifery, Medical Biology Centre; Queen's University Belfast; Belfast UK
5. Division of Maternal Health; University of Huddersfield; Huddersfield UK
6. Mother and Infant Research Unit; University of Dundee; Dundee UK