YOU , S., J. ZHOU, S. CHEN, P. ZHOU, J. LV, X. HAN, and Y. SUN. “PTCH1, a Receptor of Hedgehog Signaling Pathway, Is Correlated With Metastatic Potential of Colorectal Cancer”. Upsala Journal of Medical Sciences, vol. 115, no. 3, Mar. 2010, pp. 169–175, doi:10.3109/03009731003668316.