GSTM1 and asthma: Adherence to guideline recommendations for angina (record BP, 12-lead and exercise electrocardiogram, Hb and lipid levels, blood glucose levels, thyroid function, and record or provide advice for exercise, weight, and smoking) and medications prescribed for angina; adherence to guideline recommendations for asthma (assessment of lung function, compliance, inhaler technique, and smoking status, and provision of asthma education, action plan, smoking cessation advice, or nicotine replacement therapy) and prescription of drugs for asthma.