| http://www.w3.org/ns/prov#value | - TORONTO ??? The maker of the contraceptive device NuvaRing is informing women about new restrictions for the use of the product.Merck Canada Inc. says the prescription birth control ring should not be used by women who smoke and are over age 35 or who have at least one potentially serious medical condition, including heart disease, high blood pressure, abnormal blood-fat levels, clotting disorders
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