Annelieke Audny Lemij – MD, Ph.D. Candidate at the Department of Medical Oncology and Surgery at Leiden University Medical Center, Leiden, The Netherlands.

Joosje Charlotte Baltussen – MD, Ph.D. Candidate at the Department of Medical Oncology at Leiden University Medical Center, Leiden, The Netherlands.

Nienke Aafke de Glas – MD, Ph.D., Resident Internal Medicine/Fellow in Medical Oncology. She is also a postdoctoral researcher at the Department of Medical Oncology with main expertise in older patients with breast cancer, melanoma and colorectal cancer at Leiden University Medical Center, Leiden, The Netherlands.

Judith Rian Kroep – Medical Oncologist, Ph.D., Associate Professor research and treatment of Gynaecological Cancers – Breast Cancer – Precision Immunotherapy at Leiden University Medical Center, Leiden, The Netherlands.

Marloes Gertruda Maria Derks – MD, Ph.D., Resident Internal Medicine/Fellow in Medical Oncology. She is also a postdoctoral researcher at the Department of Medical Oncology with main expertise in older patients with breast cancer and lung cancer at Leiden University Medical Center, Leiden, The Netherlands.

Gerrit Jan Liefers – Surgical Oncologist, Ph.D., Head of the Department of Surgical Oncology at Leiden University Medical Center, Leiden, The Netherlands. His research mainly focuses on older patients with breast cancer.

Johanneke Elisabeth Antoinette Portielje – Medical Oncologist, Ph.D. Professor of Medical Oncology, in particular Geriatric Oncology at Leiden University Medical Center, Leiden, The Netherlands.

© 2022 The Author(s). Published by Elsevier B.V.