Silveirinha de Oliveira, E, Aspinall PA, Briggs, A, Cummins, C, Leyland, AH, Mitchell R, Roe, J, Ward Thompson, C. Protocol for a quasi-experimental study: How effective is the Forestry Commission Scotland’s woodland improvement programme — ‘Woods In and Around Towns’ (WIAT) — at improving psychological wellbeing in deprived communities?