Daboul, A., C. Schwahn, G. Schaffner, S. Soehnel, S. Samietz, A. Al jaghsi, M. Habes, K. Hegenscheid, R. Puls, T. Klinke and R. Biffar. "Reproducibility of Frankfort horizontal plane on 3D multi-planar reconstructed MR images." PLoS One 7(10): e48281, (2012).