1. Department of Cellular Pathology; Hospital El Bierzo; Ponferrada Spain
2. Department of Dermatology; Hospital El Bierzo; Ponferrada Spain
3. Department of Pathology; Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, INER/CIENI, Hospital Angeles Lomas, Centro Medico ABC; Huixquilucan Mexico