Understanding multilevel influences on the adaptation of a complex intervention for oncology to palliative care transitions: a qualitative study across seven European countries. - Radojičić T; Belar A; Preston N; Payne S; Surges SM; Hurducas F; Leppert W; Koper I; MartinsPereira S; Fülöp B; Hasselaar J; Arantzamendi M (BMC palliative care, 2026)