Model Formulation: Defining and Improving Data Quality in Medical Registries: A Literature Review, Case Study, and Generic Framework. - Danielle G. T. Arts; Nicolette de Keizer; Gert Jan Scheffer (J. Am. Medical Informatics Assoc., 2002)

The use of a registry database in clinical trial design: Assessing the influence of entry criteria on statistical power and number of eligible patients. - Linda Peelen; Niels Peek; Evert de Jonge; Gert Jan Scheffer; Nicolette de Keizer (Int. J. Medical Informatics, 2007)