Waern , A.U. and Hellsing , K. 1980. Indices of Alcohol Intake: Comparison between serum concentrations of alkaline phosphatase and gamma glutamyltransferase in middle-aged men. Upsala Journal of Medical Sciences. 85, 2 (June 1980), 159–163. DOI:https://doi.org/10.3109/03009738009179183.