In 1991 Brigitte Berendonk and Werner Franke , two opponents of the doping, published several theses which had been drafted former researchers in the GDR doping products which were at the Military Medical Academy Bad Saarow. Based on this work, in their book (translated from German as Doping Documents ) they were able to reconstruct the practice of doping as it was organized by the State on many great athletes from the GDR, including Marita Koch and Heike Drechsler , who have denied the allegations. Brigitte Berendonk survived a 1993 lawsuit where Drechsler accused her of lying. The lawsuit essentially validates the book. [ improper synthesis? ]  
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Ender’s natural ability was spotted when she was a child playing on family vacations, and she was trained from a young age by demanding East German coaches who included weight lifting in her training. She was 13 years old when she won two silver medals at the 1972 Olympics in Munich , West Germany . At the 1976 Games in Montreal, at age 17, she won four gold medals (in the 100-metre freestyle, the 200-metre freestyle, the 100-metre butterfly, and the 4 × 100-metre medley relay) and a silver medal (in the 4 × 100-metre freestyle relay). In three of the events she set new world records (all since broken) and in the fourth equaled an existing world record. Though Ender had excellent freestyle and butterfly strokes, it was her strong starts and expert turns that most often made the difference in her victories. Her Olympic gold medals were the first won by an East German woman swimmer. She retired soon after the Olympics, having broken 23 world records in her career.