1. Clinica Universidad de Navarra, Centro de Investigación Médica Aplicada, Pamplona, Spain;
2. Department of Immunology, Erasmus University Medical Center, Rotterdam, The Netherlands; and
3. Cancer Research Center Instituto de Biologia Celular y Molecular del Cancer-Consejo Superior de Investigaciones Científicas/University of Salamanca, Department of Medicine Cytometry Service, and Instituto Biosanitario de Salamanca, University of Salamanca, Salamanca, Spain