paragraph_text: Okka Rau (born January 5, 1977 in Leer, Lower Saxony) is a female beach volleyball player from Germany, who won the gold medal at the 2003 European Championships in Alanya, partnering Stephanie Pohl. She represented her native country at the 2004 Summer Olympics in Athens, Greece and the 2008 Summer Olympics in Beijing, China.

paragraph_text: Michelle Ballentine (born 31 August 1975, in Saint Catherine Parish) is a retired Jamaican athlete who specialised in the 800 metres. She represented her country at the 2004 Summer Olympics reaching the semifinals.

paragraph_text: Chinese Taipei left Athens with a total of five Olympic medals (two golds, two silver, and one bronze), being considered its most successful Olympics. Chinese Taipei's highlight of the Games came with a remarkable milestone for taekwondo jin Chen Shih-hsin and Chu Mu-yen, claiming the nation's first ever gold medals in Olympic history. Meanwhile, another taekwondo jin Huang Chih-hsiung picked up his second medal with a sterling silver in the men's lightweight division, adding it to his bronze from Sydney four years earlier.

paragraph_text: Na Yubo (born 12 July 1981) is a Chinese professional field hockey player who represented China at the 2008 Summer Olympics in Beijing. The team finished last in their group, and finished 11th after beating South Africa.

paragraph_text: Francesco Postiglione (born 29 April 1972 in Naples) is a former swimmer and water polo player from Italy, who represented his native country at four Summer Olympics: 1992, 1996, 2000 and 2004. At his Olympic debut he competed as a breaststroke swimmer (1992). Four years later he claimed the bronze medal with the men's national team at the 1996 Summer Olympics in Atlanta, USA.

paragraph_text: Brentjens won a gold medal for mountain biking in the 1996 Summer Olympics, the first to recognize cross-country mountain biking as an event. He followed this with bronze in the 2004 Summer Olympics. Previously he won gold at the 1995 UCI Mountain Bike & Trials World Championships. In 2007 he became 10th time Dutch National champion

paragraph_text: Chana Masson (born 18 December 1978 in Capinzal) is a Brazilian handball goalkeeper, who plays for Storhamar HE in Norway. She has represented the Brazilian national team in four Olympics. She participated at the 2000 Summer Olympics in Sydney, at the 2004 Summer Olympics in Athens, the 2008 Summer Olympics in Beijing and the 2012 Summer Olympics in London.

paragraph_text: He won the silver medal in sailing at the 1996 Summer Olympics in Atlanta. He also competed at the 2000, 2004 and 2008 Olympics, but has not won another medal. He placed 7th in both the 2000 and 2004 Summer Olympics. At the 2008 Summer Olympics, he was the Belgian flag bearer during the opening ceremony. He ultimately placed 12th alongside his helmsman Carolijn Brouwer in the Tornado-class.

paragraph_text: Liu Xia (; born January 6, 1979 in Qingdao, Shandong) is a female Chinese judoka. She was the silver medalist in the -78 kg category at the 2004 Athens Olympics. She was the 2003 Summer Universiade gold medalist and won her first continental title at the 2007 Asian Judo Championships.

paragraph_text: Roberto Calcaterra (born February 2, 1972 in Civitavecchia) is a retired water polo defense player from Italy, who represented his native country at the 1996 Summer Olympics in Atlanta, Georgia. There he won the bronze medal with the men's national team. Calcaterra also competed at the 2004 Summer Olympics in Athens, Greece.

paragraph_text: In 2022, Beijing will become the only city that has held both the summer and the winter Olympic Games. Nine cities will have hosted the Olympic Games more than once: Athens (1896 and 2004 Summer Olympics), Paris (1900, 1924 and 2024 Summer Olympics), London (1908, 1948 and 2012 Summer Olympics), St. Moritz (1928 and 1948 Winter Olympics), Lake Placid (1932 and 1980 Winter Olympics), Los Angeles (1932, 1984 and 2028 Summer Olympics), Innsbruck (1964 and 1976 Winter Olympics), Tokyo (1964 and 2020 Summer Olympics) and Beijing (2008 Summer Olympics and 2022 Winter Olympics). In addition, Stockholm hosted the 1912 Summer Olympics and the equestrian portion of the 1956 Summer Olympics. London became the first city to have hosted three Games with the 2012 Summer Olympics. Paris will become the second city to do this with the 2024 Summer Olympics, followed by Los Angeles as the third in 2028. The United States has hosted a total of eight Olympic Games, more than any other country, followed by France with five editions. Canada, Germany, Italy, Japan, and the United Kingdom have each hosted three Games.

paragraph_text: Claudio Liverziani (born 4 March 1975) is an Italian baseball player who competed in the 1996 Summer Olympics, in the 2000 Summer Olympics, and in the 2004 Summer Olympics. He also competed in the 2006 World Baseball Classic.

paragraph_text: Leonardo Binchi (born 27 August 1975) is an Italian water polo player who competed in the 2000 Summer Olympics, in the 2004 Summer Olympics, and in the 2008 Summer Olympics.

paragraph_text: Andrea Tóth (born October 4, 1980 in Budapest) is a female water polo player from Hungary, who competed for her native country at the 2004 Summer Olympics in Athens, Greece.

paragraph_text: Shen Jianqiang (born 5 August 1964) is a Chinese former swimmer who competed in the 1984 Summer Olympics, in the 1988 Summer Olympics, and in the 1992 Summer Olympics. Zhou Ming was his coach during the peak of his swimming career.

paragraph_text: Gao Chang (born January 29, 1987 in Jinan, Shandong, China) is a female Chinese swimmer, who competed at the 2004 Summer Olympics and who was a part of China's 2008 Olympic Team. She was part of the Chinese 4 x 100 m medley relay team at the 2012 Summer Olympics. Gao Chang won the gold in the 50-metre backstroke final of 2010 Asian Games.

paragraph_text: You Wenhui (; born October 20, 1979 in Shanghai) is a female Chinese beach volleyball player who competed in the 2004 Summer Olympics.

paragraph_text: Sven Thiele (born 12 May 1969 in Merseburg) is a German former wrestler who competed in the 1996 Summer Olympics, in the 2000 Summer Olympics, and in the 2004 Summer Olympics.

paragraph_text: Unison Healthcare Group (UHG; ), started out as "Unison" (友信行), is a Taiwanese medical device distributor founded in 1955, headquartered in Taipei. The corporation provides equipment and systems ranging from radiology, cardiology, orthopedic, telemedicine, medical imaging to medical robots. It is also a turnkey project and total solution provider for hospitals, offering overseas technical support in over 45 countries, such as China, Vietnam, Mongolia and Thailand.

paragraph_text: Lee Mi-sun (born 19 February 1979) is a Korean former basketball player who competed in the 2000 Summer Olympics, in the 2004 Summer Olympics, and in the 2008 Summer Olympics.

Question: What country held the 2004 Summer Olympics in the city where the headquarters of Unison Healthcare Group is located?
Answer: tw