Digital Technical and Informal Resources of Breast Cancer Patients From 2012 to 2020: Questionnaire-Based Longitudinal Trend Study

Christoph A Mallmann   ^{1, 2} , MD ;   Christian M Domröse   ^{2, 3} , MD ;   Lars Schröder   ^{3, 4} , MD ;   David Engelhardt   ^{2, 3} , MD ;   Frederik Bach   ^{2, 3} , MD ;   Helena Rueckel   ^{2, 5} , MD ;   Alina Abramian   ^{2, 5} , MD ;   Christina Kaiser   ^{2, 5} , MD ;   Alexander Mustea   ^{2, 6} , MD, PhD ;   Andree Faridi   ^{2, 5} , MD, PhD ;   Wolfram Malter   ^{2, 3} , MD ;   Peter Mallmann   ^{2, 3} , MD, PhD ;   Christian Rudlowski   ⁷ , MD, PhD ;   Oliver Zivanovic   ⁸ , MD, PhD ;   Michael R Mallmann   ^{2, 3} , MD, PhD

¹ Department of Surgery, University Hospital of Cologne, Cologne, Germany

² Center of Integrated Oncology Aachen, Köln, Bonn, Düsseldorf, Cologne, Germany

³ Department of Obstetrics & Gynecology, University Hospital of Cologne, Cologne, Germany

⁴ Department of Obstetrics & Gynecology, Klinikum Hanau, Hanau, Germany

⁵ Breast Center, University Hospital of Bonn, Bonn, Germany

⁶ Department of Gynecology & Gynecologic Oncology, University Hospital of Bonn, Bonn, Germany

⁷ Department of Obstetrics & Gynecology, Evangelic Hospital Bergisch Gladbach, Bergisch Gladbach, Germany

⁸ Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, NY, United States