Islam, F., N. Jahan, and N. Sultana. “Effect of Combined Oral Contraceptive Pill on FVC, FEV1 and FEV1/FVC%”. Journal of Bangladesh Society of Physiologist, vol. 10, no. 1, Aug. 2015, pp. 21-25, doi:10.3329/jbsp.v10i1.24613.