RT Journal Article SR Electronic(1) A1 Gebhardt, M YR 2003 T1 Marked increase of positive HIV test results in Switzerland JF Weekly releases (1997–2007) VO 7 IS 19 SP 2226 OP DO https://doi.org/10.2807/esw.07.19.02226-en UL https://www.eurosurveillance.org/content/10.2807/esw.07.19.02226-en