Key points are not available for this paper at this time.
The strengths of the register include completeness, size, and long follow-up period. It is useful for research purposes but reservations must be made regarding its validity.
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Andersen et al. (Fri,) studied this question.
www.synapsesocial.com/papers/69d81bb0a2a48916bbbef15a — DOI: https://doi.org/10.1177/1403494810394718
John Sahl Andersen
Niels de Fine Olivarius
Allan Krasnik
Scandinavian Journal of Public Health
University of Copenhagen
Department of Health Services
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