Cam Donaldson, Institute of Health and Society, University of Newcastle #60;br#62;Kevin Marsh. Matrix Knowledge Group, London, UK. #60;br#62;Miranda Mugford. Health Economics Group, University of East Anglia, UK.#60;br#62;Ian Shemilt. Health Economics Group, University of East Anglia, UK.#60;br#62;Luke Vale. Health Economics Research Unit, University of Aberdeen, UK.