Risk factors for hospitalization among adults with asthma: the influence of sociodemographic factors and asthma severity
Mark D Eisner, Patricia P Katz, Edward H Yelin, Stephen C Shiboski, and Paul D Blanc
Respir Res. 2001; 2(1): 53–60. Published online 2000 December 29. doi: 10.1186/rr37.PMCID: PMC56211