Mandatory Anonymous HIV Surveillance in Denmark: The First Results of a New System
Rix, Bo A.
American Journal of Public Health. 1994 Dec; 84(12): 1929-1932.
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Westergaard, Tine; Wohlfahrt, Jan; Aaby, Peter; Melbye, Mads (1997-03-15)OBJECTIVE: To study trends in multiple pregnancies not explained by changes in maternal age and parity patterns. DESIGN: Trends in population based figures for multiple pregnancies in Denmark studied from complete national ...