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. 2018 Sep 21;9:1025. doi: 10.3389/fphar.2018.01025

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Copyright © 2018 Bai, Tang, Chuang, Wang and Hong.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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TEM images of (A,C) DOX/NPCS, (B,D) DOX-SPIO/NPCS microparticles prepared under parameters as follows: working distance 6.5 cm high, applied voltage ranged from 10 to 17 kV, and flow rate 2 μL/min.