Carstens MH, Chin M, Li XJ. In situ osteogenesis: regeneration of 10-cm mandibular defect in porcine model using recombinant human bone morphogenetic protein-2 (rhBMP-2) and Helistat absorbable collagen sponge. J Craniofac Surg. 2005 Nov; 16(6):1033-42.