Inhalation April 2023 29
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Daryl L. Roberts, PhD, (corresponding author) is
President of Applied Particle Principles, LLC, 17347
Westham Estates Court, Hamilton, VA, 20158, US,
Tel.: +1 612 845-3293, droberts@particleprinciples.
com, www.particleprinciples.com. Jolyon P. Mitchell,
PhD, is President of Jolyon Mitchell Inhaler Consult-
ing Services, Inc., London, Ontario, Canada. Tel.:
+1 519 472-5364, mitchelljolyon@gmail.com.
