1. 1Department of Medical Oncology, University Hospital Bern, Bern, Switzerland
2. 2Breast Centre St. Gallen, Kantonsspital St. Gallen, St. Gallen, Switzerland
3. 3Kantonsspital Graubünden, Chur, Switzerland
4. 4Istituto Oncologico della Svizzera Italiana, Bellinzona, Switzerland
5. 5SAKK Coordinating Centre, Bern, Switzerland
6. 6Institute of Pathology, University of Bern, Bern, Switzerland
7. 7CURADIS GmbH, Erlangen, Germany