Probably, this is due to the versatility of the approaches and the availability of very good software toolkits.
8 teams used the Maximum Entropy (ME) statistical framework (Che et al., 2005;Haghighi et al., 2005;Park and Rim, 2005;Tjong Kim Sang et al., 2005;Sutton and McCallum, 2005;Tsai et al., 2005;Yi and Palmer, 2005;Venkatapathy et al., 2005).