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Background

  • Bengt Källén
Chapter

Abstract

In this chapter, various methodological aspects and the most common sources of information in the literature are briefly discussed. Different methods of ascertainment of congenital malformations and of drug exposure are described, the problem of confounding and of mass significance. A detailed description of the system used when analyzing the Swedish health registers with its positive and negative aspects is given.

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Bengt Källén
    • 1
  1. 1.Tornblad Institute for Comparative EmbryologyLund UniversityLundSweden

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