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In the published letter some issues are omitted due to lack of space
in print. Unfortunately this does create a biased view on the subject,
especially on the issue of non-random testing behaviour. The published
letter only refers to a bias towards the worried well and the higher socio
economic groups. But in the original electronic reply I point at the bi-
directional skewing, as there is also evidence for informed decision
taking. The issue of who is being tested (and how often) is crucial, also
in modeling. I advise readers to read the original electronic response at
the end of the original article.
JEAM van Bergen
No competing interests
25 May 2010
Jan van Bergen
Soa Aids Nederland, Keizersgracht 392, 1016 GB Amsterdam The Netherlands