Dear colleagues, I now have the copy of the requested paper. Thank you very much for such a fast response. Best regards, -- Peter T. Johannesen, PhD Instituto de Neurociencias de Castilla y León Universidad de Salamanca C/ Pintor Fernando Gallego 1, 37007 Salamanca, Spain. Phone: (+34) 923 294 500 ext. 1983 Fax: (+34) 923 294 750 E-mail: Peter@xxxxxxx