[1] DIENST MED GENET, GHENT, BELGIUM
[2] FREE UNIV AMSTERDAM, ACAD ZIEKENHUIS, 1007 MC AMSTERDAM, NETHERLANDS
[3] HAMMERSMITH HOSP, ROYAL POSTGRAD MED SCH, LONDON W12 0HS, ENGLAND
[4] UNIV HOSP WALES, CARDIFF, WALES
[5] UNIV AMSTERDAM, ACAD MED CTR, 1105 AZ AMSTERDAM, NETHERLANDS
[6] WESTERN GEN HOSP, DEPT GENET, EDINBURGH EH4 2XU, MIDLOTHIAN, SCOTLAND
[7] MARY IMOGENE BASSETT HOSP, COOPERSTOWN, NY 13326 USA