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Nease DE Jr, Volk RJ, Cass AR.Nease DE Jr, et al. Among authors: volk rj.J Am Board Fam Pract. 1999 Jan-Feb;12(1):21-31. doi: 10.3122/15572625-12-1-21.J Am Board Fam Pract. 1999.PMID: 10050640