https://www.healthcentral.com/article/asthma-trigger-versus-asthma-cause
Asthma

Asthma Trigger Versus Asthma Cause

    John Bottrell

    John Bottrell

    John Bottrell is a registered Respiratory Therapist. He wrote for HealthCentral as a health professional for Asthma and Chronic Obstructive Pulmonary Disease (COPD).