"There is no expiration date": a qualitative analysis using the Social Cognitive Theory to identify factors influencing physical activity among adults living with advanced cancer. - Agnew M; Cadmus-Bertram L; Kwekkeboom K; Gorzelitz J; Ruzicka M; Gangnon R; Andersen SW (Supportive care in cancer : official journal of the Multinational Association of Supportive Care in Cancer, 2024)