Patients are primarily recruited from a previous study, were a questionnaire was sent to all women having received an unilateral mastectomy at Aarhus University Hospital, in the period from 2009 to 2013. In the questionnaire, patients were asked to evaluate their pain in the different areas pertaining to PBTPS, and if they would allow our department to contact them in regards to the present study. If patients fulfilled the inclusion criteria, they are contacted by the primary investigator by telephone, and a meeting were the details of the study are presented is arranged. Patients with PBTPS could also be recruited during their routine visits at the department of oncology.