- Dr Eliecer Coto, Laboratorio de Genética Molecular, Hospital Central de Asturias, 33006 Oviedo, Spain. Fax 0034 985 27 36 57.
- Received April 15, 1999
- Revised June 23, 1999
- Accepted July 2, 1999
- First published December 1, 1999.
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