Open AccessArticle by 1,*, 1,*, 2, 3, 4, 5, 6, 7, 8, 8 and 9 1 Salvation Army Centre for Addiction Services and Research, Faculty of Social Sciences, University of Stirling, Stirling FK9 4LA, UK 2 NHS Lanarkshire, Bothwell G71 8BB, UK 3 School of Applied Sciences, Edinburgh Napier University, Edinburgh EH11 4BN, UK 4 School of Medicine, Molecular and Clinical Medicine, University of Dundee, Dundee DD1 4HN, UK 5 Faculty of Social Sciences, University of Stirling, Stirling FK9 4LA, UK 6...