Hefti, U., I. Scharrer, G. Risch, T. Merz, M. Bosch, D. Barthelmess, and H. Pichler. “Changes of Coagulation Parameters During High Altitude Expedition”. Swiss Medical Weekly, vol. 140, no. 0708, Feb. 2010, pp. 111-, doi:10.4414/smw.2010.12910.