Witzleb, Wolf-Christoph, Joerg Ziegler, Frank Krummenauer, Volker Neumeister, and Klaus-Peter Guenther. 2006. “Exposure to Chromium, Cobalt and Molybdenum from Metal-on-Metal Total Hip Replacement and Hip Resurfacing Arthroplasty”. Acta Orthopaedica 77 (5):697-705. https://doi.org/10.1080/17453670610012863.