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Wittert GA, Stewart DE, Graves MP, Ellis MJ, Evans MJ, Wells JE, Donald RA, Espiner EA.Wittert GA, et al. Among authors: donald ra.Clin Endocrinol (Oxf). 1991 Oct;35(4):311-7. doi: 10.1111/j.1365-2265.1991.tb03542.x.Clin Endocrinol (Oxf). 1991.PMID: 1661216Clinical Trial.