Letters to the Editor

Matouschek E (1978) Urological Research 6, 147–150.

Pain J A St Collier D J (1984) British Journal of Urology (in press).

van Dessel J Allaert L Vereecken R L Verduyn H (1982) Acta Urologica Belgica 50, 179–188.

Bakwin H (1961) Journal of Pediatrics 58, 806–819.

Barnett H L (1972) Pediatrics. 15th edn. Meredith Corporation, New York; p 1551.

Denny-Brown D Robertson E G (1933) Brain 56, 149–190.

Gesell A L Ilg F L (1943) The Infant and Child in the Culture of Today. Harper, New York; p 332.

Harbour R F Borland E M Boyd M M Miller A (1963) British Medical Journal i, 787–790.

Klackenberg G (1981) Acta Paediatrica Scandinavica 70, 453–457.

Lancet (1977) ii, 1214–1215.

Lapouse R Monk M A (1959) American Journal of Orthopsychiatry 29, 803–818.

Nelson W E (1964) Textbook of Pediatrics. 8th edn. W B Saunders, Philadelphia; p 894.

Schachter M Cotte S (1941) Zeitschrift für Kinderpsychiatrie 8, 102–112.

Wagner W Johnson Bennett S Walter D Carter R Wittner J (1982) Journal of Pediatrics 101, 302–307.