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Toia, Marco; Stocchero, Michele; Becktor, Jonas P.; Chrcanovic, Bruno; Wennerberg, Ann . (2019). Implant vs abutment level connection in implant supported screw-retained fixed partial dentures with cobalt-chrome framework: 1-year interim results of a randomized clinical study. Clinical Implant Dentistry and Related Research, (), –. doi:10.1111/cid.12717 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research