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Volume 40, no. 11, p. 4313-4316, 2002. Page 4316: The Acknowledgments section was inadvertently omitted and should appear as shown below.
We thank Miguel Angel Martínez (Fundació IrsiCaixa, Badalona, Spain) for initial technical support and helpful discussions and Juan González-Lahoz (Hospital Carlos III, Madrid, Spain) for his continuous support. This work was funded in part by grants from AIES, Instituto de Salud Carlos III, and Comunidad Autónoma de Madrid.
