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Engeler CM, DuCret RP, Ulstad V, Mahan M, Kuni CC, Boudreau RJ.Engeler CM, et al. Among authors: ulstad v.Clin Nucl Med. 1989 Jul;14(7):479-81. doi: 10.1097/00003072-198907000-00002.Clin Nucl Med. 1989.PMID: 2766630