[Grunewald, Stefan] Chinese Acad Sci, CAS MPG Partner Inst Computat Biol, Key Lab Computat Biol, 320 Yue Yang Rd, Shanghai 200032, Peoples R China.
[Long, Yangjing] Cent China Normal Univ, Sch Math & Stat, Luoyu Rd 152, Wuhan 430079, Hubei, Peoples R China.
[Wu, Yaokun] Shanghai Jiao Tong Univ, Dept Math, Dongchuan Rd 800, Shanghai 200240, Peoples R China.
[Wu, Yaokun] Shanghai Jiao Tong Univ, MOE LSC, Dongchuan Rd 800, Shanghai 200240, Peoples R China.