Long-Term Engagement With a Physical Activity App Among Gynecologic Cancer Survivors in the LETSGO Trial: 12-Month Prospective, Multicenter, Quasi-Experimental Study

Sindre Herskedal Fosstveit   ^{1, 2} , PhD ;   Ingvild Vistad   ^{3, 4} , MD, PhD ;   Mette Skorstad   ^{3, 5} , MD, PhD ;   Sveinung Berntsen   ^{1, 2} , PhD

¹ Department of Sport Science and Physical Education, Faculty of Health and Sport Sciences, University of Agder, Kristiansand, Norway

² Research Unit, Sorlandet Hospital, Kristiansand, Norway

³ Department of Gynecology and Obstetrics, Sorlandet Hospital, Kristiansand, Norway

⁴ Institute of Clinical Medicine, University of Oslo, Oslo, Norway

⁵ Medical Department, Clinical Institute II, University of Bergen, Bergen, Norway