Augmented Reality in Orthopedic Surgery Is Emerging from Proof of Concept Towards Clinical Studies: a Literature Review Explaining the Technology and Current State of the Art - Casari, Fabio A; Navab, Nassir; Hruby, Laura A; Kriechling, Philipp; Nakamura, Ricardo; Tori, Romero; Marques, Fátima de Lourdes dos Santos Nunes; Queiroz, Marcelo C; Fürnstahl, Philipp; Farshad, Mazda (Current Reviews in Musculoskeletal Medicine, 2021)