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Stemerdink, N.B.A. (author), van der Molen, M.W. (author), Kalverboer, A.F. (author), van der Meere, J.J. (author), Huisman, J. (author), de Jong, L.W. (author), Slijper, F.M.E. (author), Verkerk, P.H. (author), van Spronsen, F.J. (author), TNO Preventie en Gezondheid (author)
In this study, we tested the hypothesis that patients with early and continuously treated phenylketonuria (PKU) are selectively impaired in cognitive functions dependent on the prefrontal cortex (PFC) over a wide age range. Thirty-six patients with PKU between 8 and 20 years of age and 36 controls matched for age, sex, and educational level of...
article 1999
document
Zondervan, K.T. (author), Buitendijk, S.E. (author), Anthony, S. (author), van Rijssel, E.J.C. (author), Verkerk, P.H. (author), TNO Preventie en Gezondheid (author)
Objective. To study factors that influence the probability of episiotomy in Dutch gynaecologist-supervised deliveries. Setting. Obstetric units of Dutch hospitals. Design. Observational study. Methods. Data of 65,313 gynaecologist-supervised, vaginal deliveries of live-born singletons registered in the Dutch National Obstetric Database of 1990,...
article 1995
document
Verkerk, P.H. (author), Buitendijk, S.E. (author), Verloove-Vanhorick, S.P. (author)
Background. The validity of the results of studies using retrospectively collected information on exposures is often criticized, because cases may report differently from controls even if their true exposure status is the same. This study was performed to quantify the extent to which this effect (differential misclassification) may occur for...
article 1994
document
Verkerk, P.H. (author), Zaadstra, B.M. (author), Reerink, J.D. (author), Herngreen, W.P. (author), Verloove-Vanhorick, S.P. (author), Nederlands Instituut voor Praeventieve Gezondheidszorg TNO (author)
Social class and ethnicity are important risk factors for small-for-gestational-age and preterm delivery in many countries. This study was performed to assess whether this is also the case in the Netherlands, a country with a high level of social security, relatively small income differences and easy access to medical care for all its...
article 1994
document
Buitendijk, S.E. (author), Verkerk, P.H. (author), Verloove-Vanhorick, S.P. (author), TNO Preventie en Gezondheid (author)
article 1993
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