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van Kleffens M, Groffen CA, Dits NF, Lindenbergh-Kortleve DJ, Schuller AG, Bradshaw SL, Pintar JE, Zwarthoff EC, Drop SL, van Neck JW.van Kleffens M, et al. Among authors: bradshaw sl.Endocrinology. 1999 Dec;140(12):5944-52. doi: 10.1210/endo.140.12.7168.Endocrinology. 1999.PMID: 10579362Free article.