The American Thoracic Society. Standardization of spirometry-1994 update. Am J Respir Crit Care Med1995;152:1107–1136.
2.
European Respiratory Society. Standardized Lung Function Testing: Official statement of the European Respiratory Society. Eur J Respir Dis1993;6(S16):5–40.
3.
VerralAB, JulianJA, MuirDCF, HainesAT. Use of nose clips in pulmonary function tests. J Occ Med1989;31:29–31.
4.
RodensteinDO, StanescuDC. Soft palate and oronasal breathing in humans. J Appl Physiol1984;57(3):651–657.
