RT Journal Article SR Electronic T1 Noninvasive ventilation in mild to moderate cases of respiratory failure due to acute exacerbation of chronic obstructive pulmonary disease JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 887 OP 890 VO 26 IS 5 A1 Dhamija, Amit A1 Tyagi, Puneet A1 Caroli, Rohit A1 Ur Rahman, Mujeeb A1 Vijayan, Vannan-Kandi YR 2005 UL http://smj.org.sa/content/26/5/887.abstract AB