1 Influence of counselor characteristics and behaviors on the efficacy of a brief motivational intervention for heavy drinking in young men - A randomized controlled trial Jacques Gaume, PhD 1-2 , Molly Magill, PhD 1 , Richard Longabaugh, EdD 1 , Nicolas Bertholet, MD, MSc 2 , Gerhard Gmel, PhD 2 , Jean-Bernard Daeppen, MD 2 1 Center for Alcohol and Addiction Studies, Brown University, Providence, RI, USA. 2 Alcohol Treatment Centre, Lausanne University Hospital, Lausanne, Switzerland. Correspondence: Jacques Gaume Lausanne University Hospital, Alcohol Treatment Center Avenue de Beaumont 21 bis, Batiment P2, 1011 Lausanne, Switzerland Tel +41 21 314 73 53 Fax +41 21 314 05 62 jacques.gaume@chuv.ch Source of support: Swiss National Science Foundation, Grants FN 33CSC0-122679 and PBLAP3- 134347. Accepted for publication in Alcoholism: Clinical and Experimental Research June 2014.