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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
Thyroid conditions may make getting pregnant impossible.
Vaccines prevent between 2.5 and 4 million deaths every year.
Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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