Retinoic acid: An endogenous compound of human blood. Unequivocal demonstration of endogenous retinoic acid in normal physiological conditions von De Ruyter, Marcel G., Lambert, Willy E., De Leenheer, AndréP.

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Communication channel consideration for in‐home services: The moderating role of customer participation von van Birgelen, Marcel, Dellaert, Benedict G.C., de Ruyter, Ko

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The cortisol responses to 5-hydroxytryptophan, orally, in depressive inpatients von Maes, Michaël, De Ruyter, Marcel, Claes, Rik, Bosma, Geert, Suy, Eduard

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Simultaneous determination of retinol and α-tocopherol in human serum by high-performance liquid chromatography von De Leenheer, Andre P., De Bevere, Veerle O.R.C., De Ruyter, Marcel G.M., Claeys, Albert E.

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A method for the statistical evaluation of results in external quality control surveys von De Leenheer, Andre P., De Ruyter, Marcel G.M., Steyaert, Herman L.C.

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