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Christiane Eickhoff; Andrea Hämmerlein; Nina Griese; Martin Schulz. (2012). Nature and frequency of drug-related problems in self-medication (over-the-counter drugs) in daily community pharmacy practice in Germany. , 21(3), 254–260. doi:10.1002/pds.2241 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research