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Pilz, Stefan; Dobnig, Harald; Tomaschitz, Andreas; Kienreich, Katharina; Meinitzer, Andreas; Friedl, Claudia; Wagner, Doris; Piswanger-Sölkner, Claudia; März, Winfried; Fahrleitner-Pammer, Astrid . (2012). Low 25-Hydroxyvitamin D Is Associated with Increased Mortality in Female Nursing Home Residents. The Journal of Clinical Endocrinology & Metabolism, 97(4), E653–E657. doi:10.1210/jc.2011-3043 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research