<qa>  What is the primary objective of this study?The primary objective of this study is to determine the accuracy of the Reflux Disease Questionnaire RDQ as a diagnostic test for gastroesophageal reflux disease. Symptom evaluation by the RDQ will be compared with other established approaches to the diagnosis of gastroesophageal reflux disease GERD in a primary care patient population with symptoms thought to be of upper gastrointestinal GI tract origin. 