Zembić A, Johannesen LH, Schou S, Malo P, Reichert T, Farella M et al. Immediately restored one-piece single-tooth implants with reduced diameter: one-year results of a multi-center study. Clinical Oral Implants Research. 2012;23(1):49-54. doi: 10.1111/j.1600-0501.2011.02174.x