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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Volume size distribution of particle fraction in powder inhalers, polyDBB_PEG_600_20 microspheres, obtained by using homogenization speed of 9000 rpm (A) and 18,000 rpm (B).