Similar title to Galis, F., Van Dooren, T.J.M., Feuth, J.D., Metz, J.A.J., Witkam, A., Ruinard, S., Steigenga, M.J., & Wijnaendts, L.C.D. (2006). Extreme Selection in Humans Against Homeotic Transformations of Cervical Vertebrae. IIASA Interim Report. IIASA, Laxenburg, Austria: IR-06-071