Extract the names of the winners of the Berlin Marathon from the reference text and provide them as a bulleted list.

Context: The Berlin Marathon was established in 1974 by Horst Milde, a baker and running enthusiast in the city. The race had 244 finishers; 234 men and 10 women, and was won by Günter Hallas and Jutta von Haase in times of 2:44:53 and 3:22:01 respectively. In 1977, Christa Vahlensieck established a new women's world record at the Berlin Marathon, running 2:34:47. Four years later, the race started outside the Reichstag for the first time, by which time it had grown to 2,583 finishers, making it the largest city road race in Germany. The following year, before German unification, some East Germans secretly ran the race, registering under false names to avoid recriminations from the East German secret service. In 1989, a children's race was added to the event, and eight years later an inline skating marathon was contested.

In 1998, Ronaldo da Costa set a new men's world record, the only South American to hold a marathon world record. Two years later, one of the race's pacemakers, Simon Biwott won the race, after one of the favourites had pulled out in the second half of the race. In 2001, Naoko Takahashi became the first woman to run a sub-2:20 marathon, completing the Berlin Marathon in 2:19:46. The race had continued to be the venue of world records; between 2003 and 2018, seven men's records were set at the race; the most recent remains as the current world record time; Eliud Kipchoge's 2:01:39.

The event was held in mid-September in 2000 and 2018, because of a conflict with the Women's Olympic Marathon, and due to German Unity Day preparations, respectively.

The 2020 edition of the event was prohibited from being held on its originally scheduled dates due to the coronavirus pandemic, and was eventually cancelled once it was clear that it would not be possible to hold it at a later date in 2020. All registrants were given the option of either transferring their entry to 2021 or obtaining a refund.

Answer: * Günter Hallas
* Jutta van Hasse
* Christa Vahlensieck
* Ronaldo da Costa
* Simon Biwott
* Naoko Takahashi
* Eliud Kipchoge