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Koletzko, Berthold; Knoppke, B.; Schenck, Ursula von; Demmelmair, Hans; Damli, A. (1999): Noninvasive assessment of essential fatty acid status in preterm infants by buccal mucosal cell phospholipid analysis. In: Journal of pediatric gastroenterology and nutrition, Vol. 29, No. 4: pp. 467-474