Hartlev J, Erik Nørholt S, Spin-Neto R, Kraft D, Schou S, Isidor F. Histology of augmented autogenous bone covered by a platelet-rich fibrin membrane or deproteinized bovine bone mineral and a collagen membrane: A pilot randomized controlled trial. Clinical Oral Implants Research. 2020 aug. 1;31(8):694-704. doi: 10.1111/clr.13605