BERGMAN B., BERGQVIST D., and DAHLGREN S. “The Incidence of Venous Thrombosis in the Lower Limbs Following Elective Gallbladder Surgery: A Study With the 125I-Fibrinogen Test”. Upsala Journal of Medical Sciences, vol. 80, no. 1, Feb. 1975, pp. 41-45, doi:10.3109/03009737509178989.