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Kato, Takahiro; Abrahamsson, Ingemar; Wide, Ulla; Hakeberg, Magnus . (2018). Periodontal disease among older people and its impact on oral health-related quality of life. Gerodontology, (), –. doi:10.1111/ger.12363 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research