- Expression of the extracellular matrix proteins collagen I, collagen III and fibronectin and matrix metalloproteinase-1 and -13 in the skin of patients with inguinal hernia. Klinge, U., Zheng, H., Si, Z., Schumpelick, V., Bhardwaj, R.S., Muys, L., Klosterhalfen, B. European surgical research. Europäische chirurgische Forschung. Recherches chirurgicales européennes. (1999)