Information: - Kayserispor is a professional Turkish football club located in the city of Kayseri. The club colours are red and yellow, and the club play their home matches at Kadir Has Stadium. The club has won one Turkiye Kupas, in 2008, and finished as runners-up in the Super Kupa the same year. They became fifth in the Super Lig four times, in 200506, 200607, 200708, and 201213. The club was also one of the co-winners of the 2006 Intertoto Cup. - TFF Second League (Turkish Football Federation Second League) or "TFF 2. Lig" (in Turkish), is the third level in the Turkish football league system. It was founded in 2001-02 season with the name of "Turkish Second League Category B" as a continuation of then second level division. In 200506 the name of the league was changed to "Lig B". Since the 200708 season the league's current name is used along with sponsor names. - Bolu Province is a province in northwestern Turkey. It's an important midpoint between the capital, Ankara and the largest city in the country, Istanbul. It covers an area of 7,410km, and the population is 271,208. - Murat Duruer (born 15 January 1988 in Gerede, Bolu Province) is a Turkish professional footballer for Turkish Super Lig club Kayserispor. He currently plays as a left winger. - Mustafa Duruer ( born January 15 , 1988 in Gerede , Bolu Province ) is a Turkish football player . He currently plays for Bugsaspor in the TFF Second League . He is the twin brother of Murat Duruer . - Gerede is a town and a district of Bolu Province in the Black Sea region of Turkey. It is located on the highway from Istanbul to Ankara (approximately from Ankara, where the road to the Black Sea coast brances off). It covers an area of , and the population (2000) is 41,391 of which 25,200 live in the town of Gerede. Elevation is about 1,450 m. The mayor is Omer Baygn (AKP). - Ankara (; ), formerly known as Ancyra and Angora, is the capital of the Republic of Turkey. With a population of 4,587,558 in the urban center and 5,150,072 in its province , it is Turkey's second largest city after Istanbul. - Istanbul (or ), historically known as Constantinople and Byzantium, is the most populous city in Turkey and the country's economic, cultural, and historic center. Istanbul is a transcontinental city in Eurasia, straddling the Bosphorus strait (which separates Europe and Asia) between the Sea of Marmara and the Black Sea. Its commercial and historical center lies on the European side and about a third of its population lives on the Asian side. The city is the administrative center of the Istanbul Metropolitan Municipality (coterminous with Istanbul Province), both hosting a population of around 14.7 million residents. Istanbul is one of the world's most populous cities and ranks as the world's 7th-largest city proper and the largest European city. - The Super Lig ("Super League") is a Turkish professional league for association football clubs. It is the top-flight of the Turkish football league system. It is one of the top leagues in the UEFA confederation, and the winner of the competition automatically qualifies for the UEFA Champions League group stage. Eighteen clubs compete annually, where a champion is decided and three clubs are promoted and relegated from, and to, the 1. Lig. The season runs from August to May, with each club playing 34 matches. Matches are played Friday through Monday. It is sponsored by "Spor Toto" and therefore officially known as the Spor Toto Super Lig. - Bolu is a city in Turkey, and administrative center of the Bolu Province. The population is 131,264 (2012 census). The mayor is Alaaddin Ylmaz (AK Party) since local elections in 2004. Given the paragraphs above, decide what entity has the relation 'date of birth' with '15 january 1988'.
Answer:
mustafa duruer