National Natural Science Foundation of China [61202011, 61033003, 91130034, 30870826]; Ph.D. Programs Foundation of Ministry of Education of China [20100142110072]; Fundamental Research Funds for the Central Universities [2010ZD001, 2010MS003]; National Science Foundation of Hubei Province [2008CDB113, 2011CDA027]
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Song et al. (2013) studied this question.
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