1. Institute of Health and Wellbeing; College of Medical Veterinary and Life Sciences; University of Glasgow; Glasgow G12 8RZ U.K
2. Department of Psychiatry; Medical Sciences Division; University of Oxford; Oxford OX3 7JX U.K
3. Department of Dermatology and Academic Wound Healing; Institute of Infection and Immunity; School of Medicine; Cardiff University; Cardiff CF14 4XN U.K
4. Cochrane Institute of Primary Care and Public Health; School of Medicine; Cardiff University; Cardiff CF14 4YS U.K