MulTI-domain self-management in older People wiTh OstEoarthritis and multi-morbidities: protocol for the TIPTOE randomised controlled trial oleh Rachel Deere, Philip Pallmann, Victoria Shepherd, Lucy Brookes-Howell, Andrew Carson-Stevens, Ffion Davies, Emma Dunphy, Preeti Gupta, Mary Hickson, Val Hill, Kate Ingarfield, Nicola Ivins, Fiona Jones, Robert Letchford, Rachel Lowe, Sarah Nash, Paula Otter, Hayley Prout, Elizabeth Randell, Bernadette Sewell, Debs Smith, Robert Trubey, Tom Wainwright, Monica Busse, Kate Button