551,222 RAMSTEDT KRISTINA An epidemiological approach to Sexually Transmitted Diseases with special reference to contact tracing and screening : [akademisk avhandling] / by Kristina Ramstedt ; from the Department of Dermato-Venerology, University of Göteborg. -Göteborg i University, 1991. - 96 :. wiele liczb, : il., wykr. ; 25 cm (Acta Dermato-Venerologica ; suppl. 157) Zawiera 6 prac współaut. ISBN 91-628-0231-3