Use of a disposable valved-holding chamber (spacer) in a
school-based asthma trial

Goodwin, James L, et al. “Use of a Disposable Valved-Holding Chamber (spacer) in a School-Based Asthma Trial”. J. Allergy Clin. Immunol. Pract., vol. 6, no. 1, Jan. 2018, pp. 307–309.