Waern A. Urban, and Hellsing Krister. 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):159-63. https://doi.org/10.3109/03009738009179183.