Answers are grounded in this paper and cite their sources.
Yangyang Shi, Kaisheng Yao, Hu Chen, Dong Yu, Yi-Cheng Pan, Mei-Yuh Hwang. Proceedings of the 2016 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies. 2016.
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Shi et al. (2016) studied this question.