Sudden-onset asthma exacerbations: clinical features, response to therapy, and 2-week follow-up. Multicenter Airway Research Collaboration (MARC) investigators
RG Barr, PG Woodruff, S Clark, Camargo CA Jr
European Respiratory Journal 2000 15: 266-273; DOI: 10.1034/j.1399-3003.2000.15b08.x