Non-pharmacological educational and self-management interventions for people with chronic headache: the CHESS research programme including a RCT oleh Underwood Martin, Achana Felix, Carnes Dawn, Eldridge Sandra, Ellard David R, Griffiths Frances, Haywood Kirstie, Hee Siew Wan, Higgins Helen, Mistry Dipesh, Mistry Hema, Newton Sian, Nichols Vivien, Norman Chloe, Padfield Emma, Patel Shilpa, Petrou Stavros, Pincus Tamar, Potter Rachel, Sandhu Harbinder, Stewart Kimberley, Taylor Stephanie JC, Matharu Manjit