scientific article published on 16 January 2009
author: George Kirov, Michael C O'Donovan, Radoslava Vazharova, Todor Tolev, Draga Toncheva, Michiaki Kubo, Atsushi Takahashi, Yūsuke Nakamura, Naoyuki Kamatani, Elitza T. Betcheva, Sena Karachanak-Yankova, Ivanka Dimova, Vihra Milanova
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