W.-C. Witzleb, J. Ziegler, F. Krummenauer, V. Neumeister, and K.-P. Guenther, “Exposure to chromium, cobalt and molybdenum from metal-on-metal total hip replacement and hip resurfacing arthroplasty”, ActaO, vol. 77, no. 5, pp. 697–705, Jan. 2006.