TY - Jour Au - Ramsdale，Helen Py - 2002 Da - 1900/01/01 Ti - Canadian Thoracic Society SP - 458549 VL - 9 AB - SN - 1198-2241 UR - Https://Doi.org/10.1155 / 2002/458549 DO - 10.1155 / 2002/458549 JF - 加拿大呼吸期刊PB - Pulsus Group Inc Kw-Er -