Distinguished Yale epidemiologist Harvey Risch has written extensively on the meticulous research demonstrating the efficacy of the early administration of HCQ in combination with the antibiotic azithromycin and zinc. Conclusions from this research are based on criteria developed by British epidemiologist Sir Bradford Hill and Sir Richard Doll, two of the first scientists to discover the causal link between tobacco smoking and lung cancer, criteria that laid the foundations of modern epidemiology and that are used to this day to determine whether an observed association can be ascribed to causation.

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