Prevalence and Characterization of Spontaneous Oral Breathing in Preterm Infants - de Almeida, Victor; Alvaro, Ruben; Al-Alaiyan, Saleh; Haider, Zia; Rehan, Virender; Cates, Don; Nowaczyk, Bogdan; Kwiatkowski, Kim; Rigatto, Henrique (American Journal of Perinatology, 1995)