“We have to change our mindsets”: a qualitative study of barriers and facilitators in research collaboration across integrated care system organisations oleh Christopher J. Gidlow, Lorna Sams, Kim Buckless, Naomi J. Ellis, Helen C. Duffy, Ruth Lambley-Burke, Paul Campbell, Alison Cooke, Krysia Dziedzic, Matthew Brookes, Nachiappan Chockalingam, Pam Devall, Christian Mallen