Quoted: That can make it hard for doctors to decide on treatment and for experts to compare studies aimed at determining the optimal level of vitamin D in the blood. â??If you get your vitamin D level measured in the Mayo Clinic, the Cleveland Clinic and the Timbuktu Clinic, it would be nice if it came out the same value,â? said Dr. Neil C. Binkley, associate professor of medicine at the University of Wisconsin.
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