Sentinel node biopsy as a practical alternative to axillary lymph node dissection in breast cancer patients: an approach to its validity. - Fraile,M.; Rull,M.; Julian,F.J.; Fuste,F.; Barnadas,A.; Llatjos,M.; Castella,E.; Gonzalez,J.R.; Vallejos,V.; Alastrue,A.; Broggi,M.A. (Ann Oncol, 2000)