department of Gastroenterology and Hepatology;
Federal Research Center of Nutrition;
Biotechnology;
and Food Safety;
Moscow 115446;
Russia;
gastroesophageal; reflux; disease; psyllium; gastroesophageal; reflux; lower; esophageal; sphincter; relaxation; esophageal; motility; Dietary; fiber; heartburn; non-erosive; gastroesophageal; reflux; disease;