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Marsman GJ, Gruppen H, van der Poel AF, Kwakkel RP, Verstegen MW, Voragen AG.Marsman GJ, et al. Among authors: kwakkel rp.Poult Sci. 1997 Jun;76(6):864-72. doi: 10.1093/ps/76.6.864.Poult Sci. 1997.PMID: 9181620Free article.