During each four-week interval, patients made three visits to a clinical trial center, where they filled out a quality-of-life questionnaire on the impact of chronic cough on activities of daily living.

• 在每个研究阶段，患者都要去某个临床试验中心三次，在那里他们要完成一份有关慢性咳嗽对日常生活影响的生活质量调查问卷。