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. 2021 May 4;13(5):657. doi: 10.3390/pharmaceutics13050657

Figure 4.

Figure 4

Test bench with two integrated laser-based optical measurement units added upstream from the gravimetric filters, simulating preterm neonate breathing characteristics. This test bench is based on the setup described in Wiegandt et al. [33], Journal of Aerosol Medicine and Pulmonary Drug Delivery, 2021.