PT - JOURNAL ARTICLE AU - Swartz, Edina AU - Lang, David TI - When should a methacholine challenge be ordered for a patient with suspected asthma? DP - 2008 Jan 01 TA - Cleveland Clinic Journal of Medicine PG - 37--40 VI - 75 IP - 1 4099 - http://www.ccjm.org/content/75/1/37.short 4100 - http://www.ccjm.org/content/75/1/37.full SO - Cleve Clin J Med2008 Jan 01; 75