Minorities in Greece are small in size compared to Balkan regional standards, and the country is largely ethnically homogeneous. This is mainly due to the population exchanges between Greece and neighboring Turkey (Convention of Lausanne) and Bulgaria (Treaty of Neuilly), which removed most Muslims (with the exception of the Muslims of Western Thrace) and those Christian Slavs who did not identify as Greeks from Greek territory. The treaty also provided for the resettlement of ethnic Greeks from those countries, later to be followed by refugees. There is no official information for the size of the ethnic, linguistic and religious minorities because asking the population questions pertaining to the topic have been abolished since 1951.