- Dr Manuel Rodríguez Díaz, Department of Physiology, Faculty of Medicine, University of La Laguna, 38320, Tenerife, Spain. Fax 00349 22 319397.
- Received March 12, 1997
- Revised June 11, 1998
- Accepted June 15, 1998
- First published December 1, 1998.
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