Study of the level of sputum matrix metalloproteinase-9 (MMP-9) and tissue inhibitor metalloproteinase-1 (TIMP-1) n COPD patients Fraction of exhaled nitric oxide measurement as a biomarker in asthma and COPD compared with local and systemic inflammatory markers Study of serum C-reactive protein level and sputum eosinophils in patients with bronchial asthma Measurement of exhaled nitric oxide in healthy Egyptian population: normal ranges and factors affecting Left ventricular diastolic dysfunction in patients with chronic obstructive pulmonary disease (COPD), prevalence and association with disease severity: Using tissue Doppler study Study of influenza A H1N1 infection in Qalubia during the last 2009 pandemic Study the level of sputum matrix metalloproteinase-9 and tissue inhibitor metaloprotienase-1 in patients with interstitial lung diseases Study on the association between eosinophilic esophagitis and bronchial asthma in Egyptian patients with esophageal symptoms Prevalence of anxiety and depression in patients with airway obstruction using hospital anxiety and depression scale (HADS) in different localities of Saudi Arabia