1. School of Sociology, Social Policy and Social Work, Queen's University; Director, Institute of Child Care Research; 6 College Park Belfast Northern Ireland UK BT7 1LP
2. Queen's University; School of Sociology, Social Policy and Social Work; Belfast Northern Ireland UK BT7 1LP
3. MRC Biostatistics Unit; Institute of Public Health Robinson Way Cambridge UK CB2 0SR
4. Queen's University; c/o Developmental, Psychosocial and Learning Problems Group; Belfast UK