- Correspondence to: J Steffann service de génétique médicale, Hôpital Necker-Enfants Malades, 149 rue de Sèvres, 75743 Paris cedex 15, France;
- Received December 21, 2006
- Accepted May 11, 2007
- Revised May 9, 2007
- First published June 1, 2007.
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