3Raza N,Bielefeldt K.Discriminative value of anorectal manometry in clinical practice[J].Dig Dis Sci,2009,54(11):2503-2511.
4Karlbom U,Lundin E,Graf W,et al.Anorectal physiology in relation to clinical subgroups of patients with severe constipation[J].Colorectal Dis,2003,6(5):343-349.