E. Högberg, A. Stålman, T. Wredmark, J. A. Tsai, P. Arner, and L. Felländer-Tsai, “Opioid requirement after arthroscopy is associated with decreasing glucose levels and increasing PGE2 levels in the synovial membrane”, ActaO, vol. 77, no. 4, pp. 657–661, Jan. 2006.