Beumer, A., Lampe, H. I. H., Swierstra, B. A., Diepstraten, A. F. M., & Mulder, P. G. H. (1997). The straight line graph in limb length inequality a new design based on 182 Dutch children. Acta Orthopaedica, 68(4), 355–360. https://doi.org/10.3109/17453679708996177