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Thoma, Daniel S; Beni, Goran I; Zwahlen, Marcel; Hämmerle, Christoph H F; Jung, Ronald E (2009). A systematic review assessing soft tissue augmentation techniques. Clinical oral implants research, 20(s4), pp. 146-165. Oxford: Wiley-Blackwell 10.1111/j.1600-0501.2009.01784.x
