Constipation in Neurological DiseasesJNNP 74:13-19, Winge,K.,et al, 2003
Gastorintestinal Manifestations of SclerodermaGastroenterol Clin 27:563-594, Rose,S.,et al, 1998
Motor Neuron DiseaseJNNP 57:886-896, Leigh,P.N.&Ray-Chaudhuri,K., 1994