A feasibility study evaluating rhBMP-2/absorbable collagen sponge for maxillary sinus floor augmentation. - Boyne,P.J.; Marx,R.E.; Nevins,M.; Triplett,G.; Lazaro,E.; Lilly,L.C.; Adler,M.; Nummikowski,P. (Int J Periodontics Restorative Dent, 1997)