RT Journal Article SR Electronic T1 Re. Calibration of peak expiratory flow (PEF) measuring devices JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1152 OP 1152 DO 10.1183/09031936.93.04091152 VO 4 IS 9 A1 JS Milledge YR 1991 UL http://erj.ersjournals.com/content/4/9/1152.abstract AB