homeland of Proto-Korean and of early Koreans is located somewhere in Southern Siberia/Manchuria, such the Liao river area or the Amur region. Later, Koreanic-speakers migrated to northern Korea and started to expand further south, replacing and assimilating Japonic-speakers and likely causing the Yayoi migration. Whitman (2012) suggests that the Proto-Koreans arrived in the southern part of the Korean Peninsula at around 300 BCE and coexisted with the descendants of the Japonic Mumun cultivators (or assimilated them). Vovin suggests Proto-Korean is equivalent to the variant of Koreanic languages spoken in southern Siberia/Manchuria and northern Korean peninsula by the time of the Three Kingdoms of Korea period and spread to southern Korea through influence from Goguryeo migrants. However, a number of Korean scholars such as Jangsuk Kim and Jinho Park reject the view that the Korean speakers were not native to the Korean Peninsula, and argue that no solid evidence of such linguistic migration/shift as well as population and material change in the peninsular region has ever been found to support such view. The largest concentration of dolmens in the world is found on the Korean Peninsula. In fact, with an estimated 35,000-100,000 dolmen, Korea accounts for nearly 40% of the world's total. Similar dolmens can be found in Manchuria, the Shandong Peninsula and the Kyushu island, yet it is unclear why this culture only flourished so extensively on the Korean Peninsula and its surroundings compared to the bigger remainder of Northeast Asia. Anthropometry Stephen Pheasant (1986), who taught anatomy, biomechanics and ergonomics at the Royal Free Hospital and the University College, London, said that Far Eastern people have proportionately shorter lower limbs than Europeans and black Africans. Pheasant said that the proportionately short lower limbs of Far Eastern people is a difference that is most characterized in Japanese people, less characterized in Korean and Chinese people, and the least characterized in Vietnamese and Thai people. Neville Moray (2005) said that, for Korean and Japanese pilots, sitting height is more than 54% of their stature, with about 46% of their stature from leg length. Moray said that, for Americans and most Europeans, sitting height is about 52% of their stature, with about 48% of their stature from leg length. Craniometry In a craniometric study, Pietrusewsky (1994) found that the Japanese series, which was a series that spanned from the Yayoi period to modern times, formed a single branch with Korea. Later, Pietrusewsky