<qa>  What is a subchronic, or chronic cough due to?- A subchronic, or chronic cough due to any condition other than an URTI or common cold as established by the investigator, nurse practitioner, or physicians assistant, in accordance with the American College of Chest Physicians ACCP Guidelines for Diagnosis and Management of Cough. Special attention should be paid to highly prevalent conditions commonly presenting with cough such as asthma, rhinitis, or gastroesophageal reflux disease GERD. 