Electrogastrography in pediatric functional dyspepsia: relationship to gastric emptying and symptom severity. - Friesen CA; Lin Z; Hyman PE; Andre L; Welchert E; Schurman JV; Cocjin JT; Burchell N; Pulliam S; Moore A; Lavenbarg T; McCallum RW (Journal of pediatric gastroenterology and nutrition, 2006)