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Ketterling RP, Bottema CD, Koeberl DD, Ii S, Sommer SS.Ketterling RP, et al. Among authors: sommer ss.Hum Genet. 1991 Jul;87(3):333-7. doi: 10.1007/BF00200915.Hum Genet. 1991.PMID: 1864609