Is it true that hardening is an effective method of preventing colds?

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Is it true that hardening is an effective method of preventing colds? - My, Health, Person, Organism, Stress, Hardening, Cold, freezing, Temperature, Disease, Treatment, Prophylaxis, Cold, Immunity, The medicine, Facts, Проверка, Research, Informative, Longpost

Is it true that hardening is an effective method of preventing colds? - My, Health, Person, Organism, Stress, Hardening, Cold, freezing, Temperature, Disease, Treatment, Prophylaxis, Cold, Immunity, The medicine, Facts, Проверка, Research, Informative, Longpost

Is it true that hardening is an effective method of preventing colds? - My, Health, Person, Organism, Stress, Hardening, Cold, freezing, Temperature, Disease, Treatment, Prophylaxis, Cold, Immunity, The medicine, Facts, Проверка, Research, Informative, Longpost

Disease Hardening Health Immunity Research Treatment The medicine freezing Organism Informative Проверка Cold Prophylaxis Stress Temperature Facts Cold Person

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