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Hokken-Koelega AC, Stijnen T, de Jong RC, Donckerwolcke RA, Groothoff JW, Wolff ED, Blum WF, de Muinck Keizer-Schrama SM, Drop SL.Hokken-Koelega AC, et al. Among authors: stijnen t.Kidney Int Suppl. 1996 Jan;53:S128-34.Kidney Int Suppl. 1996.PMID: 8771007Clinical Trial.