作者单位:King George Med Univ, Dept Community Med & Publ Hlth, Lucknow 226003, Uttar Pradesh, India[1]King George Med Univ, Dept Pharmacol & Therapeut, Lucknow 226003, Uttar Pradesh, India[2]King George Med Univ, Dept Resp Med, Lucknow 226003, Uttar Pradesh, India[3]King George Med Univ, Dept Biochem, Lucknow 226003, Uttar Pradesh, India[4]