TY - JOUR AU - Singh, S J; Morgan, M D; Scott, S TI - Development of a shuttle walking test of disability in patients with chronic airways obstruction JO - Thorax VL - 47 PY - 1992 DO - 10.1136/thx.47.12.1019 L3 - PubMed-ID: 1494764 SP - 1019 EP - 1024 N1 - et al. ER -