Protocol for a randomised controlled trial of a primary care intervention to Reverse Frailty and Enhance Resilience through Exercise and dietary protein Education (REFEREE) in comm... oleh John Travers, Roman Romero-Ortuno, Dermot Power, Peter Doran, John Langan, Fergal MacNamara, Darren McCormack, Christopher McDermott, Jude McEntire, Joanne McKiernan, Sebastian Vencken, Andrew W. Murphy, Patrick J. Murphy, Éidin Ní Shé, Diarmuid O'Shea, Marie-Therese Cooney