1. Division of Breast Cancer Research, Breakthrough Breast Cancer Research Centre Institute of Cancer Research London UK
2. Department of Pathology, Instituto de Biomedicina de Sevilla CSIC–Universidad de Sevilla, Hospital Universitario del Rocío Seville Spain
3. European Cancer Stem Cell Research Institute, Cardiff School of Biosciences, Cardiff University Cardiff UK
4. Department of Pathology, Hospital Universitario Ramón y Cajal, Instituto Ramón y Cajal de Investigaciones Sanitarias Madrid Spain
5. Department of Pathology Memorial Sloan‐Kettering Cancer Center New York USA