Correspondence to Dr Fozia Roked, Birmingham Children's Hospital, Steelhouse Lane, Birmingham B4 6NH, UK; fozia.roked{at}doctors.org.uk Setting: Dunedin, New Zealand, participants born in 1972–1973.

Correspondence to Dr William Whitehouse, School of Human Development, University of Nottingham, E Floor East Block, Queen's Medical Centre, Nottingham NG7 2UH, UK ...

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