Additional file 1: of A pilot feasibility randomised controlled trial of an adjunct brief social network intervention in opiate substitution treatment services DayEd CopelloAlex SeddonJennifer ChristieMarilyn BamberDeborah PowellCharlotte BennettCarmel AkhtarShabana GeorgeSanju BallAndrew FrewEmma GoranitisIlias FreemantleNick 2018 Minimum, maximum, and mean session duration in minutes by trial arm. A comparison of the treatment session lengths between the three trial arms. (DOCX 16 kb)