Case-finding of chronic obstructive pulmonary disease with questionnaire, peak flow measurements and spirometry: a cross-sectional study. - Mahboub, Bassam; Alzaabi, Ashraf; Soriano, Joan B.; Salameh, Laila; Mutairi, Yousef A. L.; Yusufali, Afzalhussein A.; Alsheikh-ali, Alawi; Almahmeed, Wael; Haughney, John (BMC Research Notes, 2014)