Thed N. van Leeuwen

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BACKGROUND In medical curricula, considerable effort is put into scientific education and research training. The output of these efforts, however, is not known. AIM To assess the number of students who published at least one scientific paper during the course of their medical studies. METHODS Names and initials of all students who received their medical(More)
BACKGROUND The UK, like some other countries, carries out a periodic review of research quality in universities and the most recent Research Excellence Framework (REF) reported a doubling (103% increase) in its "world leading" or so-called "4*" research outputs in the areas of life sciences and medicine between 2008 and 2014. This is a remarkable(More)
In this article, we present the results of an analysis that describes the research centered on Journal Impact Factors (JIFs). The purpose of the analysis is to make a start of studying part of the field of quantitative science studies that relates to the most famous and classic bibliometric indicator around and to see what characteristics apply to the(More)
OBJECTIVE To assess the quality of scientific research funded by the Netherlands Heart Foundation (NHF), using bibliometrical analysis of published research results, in order to determine whether the resources of the NHF for research were being invested wisely. DESIGN Retrospective, descriptive. METHOD The publication data concerning research projects(More)
The authors provide an overview of advanced bibliometric methods for (a) an objective and transparent assessment of journal performance and (b) positioning of a journal in relation to other journals. These methods are applied to Psychotherapy Research, an international journal within the field of clinical psychology. In the first analysis, the authors focus(More)
BACKGROUND The fifth Millennium Development Goal formulated by the WHO in 2000 aimed to reduce global maternal mortality by 75% in 2015. We studied the extent to which medical research has supported this by studying maternal mortality. We performed a bibliometric analysis of the literature on maternal mortality and of the development of this literature over(More)
AIMS Performance of randomized controlled drug trials (drugRCTs) adds to the scientific output, scientific knowledge, scientific training and up-to-date status of healthcare and may drive economy. The purpose of this study was to benchmark Europe's position on drugRCTs relative to the rest of the world, and to identify factors that may drive this(More)
OBJECTIVE Most of the biomedical research is performed in University Medical Centers (UMC's). Increasingly, however, biomedical research is also done in non-academic large teaching hospitals, united in the Organization for Topclinical Hospitals (STZ) in the Netherlands. The objective of this study was to compare citation scores of biomedical publications(More)