PT - JOURNAL ARTICLE AU - Hartmut Gehring TI - The authors respond DP - 2007 Mar 01 TA - Respiratory Care PG - 340--341 VI - 52 IP - 3 4099 - http://rc.rcjournal.com/content/52/3/340.1.short 4100 - http://rc.rcjournal.com/content/52/3/340.1.full