Correction to: Journal of Pharmaceutical Investigation https://doi.org/10.1007/s40005-018-00414-y, https://doi.org/10.1007/s40005-018-00418-8, https://doi.org/10.1007/s40005-019-00441-3, https://doi.org/10.1007/s40005-019-00446-y

The article Pharmaceutical applications of 3D printing technology: current understanding and future perspectives, written by Byeong Ju Park, Ho Jae Choi, Sang Ji Moon, Seong Jun Kim, Rajiv Bajracharya, Jeong Youn Min, and Hyo-Kyung Han, was originally published electronically on the publisher’s internet portal (currently SpringerLink) on 29 October 2018 without open access. With the author(s)’ decision to opt for Open Choice the copyright of the article changed on 23 September 2019 to © The Author(s) 2018 and the article is forthwith distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, duplication, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

The article Potential of nanoparticulate carriers for improved drug delivery via skin, written by Alam Zeb, Sadia Tabassam Arif, Maimoona Malik, Fawad Ali Shah, Fakhar Ud Din, Omer Salman Qureshi, Eun‑Sun Lee, Gwan‑Yeong Lee, and Jin‑Ki Kim, was originally published electronically on the publisher’s internet portal (currently SpringerLink) on 4 December 2018 without open access. With the author(s)’ decision to opt for Open Choice the copyright of the article changed on 23 September 2019 to © The Author(s) 2018 and the article is forthwith distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, duplication, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

The article PLA/PLGA nanoparticles prepared by nano spray drying, written by Cordin Arpagaus, was originally published electronically on the publisher’s internet portal (currently SpringerLink) on 16 April 2019 without open access. With the author(s)’ decision to opt for Open Choice the copyright of the article changed on 23 September 2019 to © The Author(s) 2019 and the article is forthwith distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, duplication, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

The article Meeting the unmet: from traditional to cutting-edge techniques for poly lactide and poly lactide-co-glycolide microparticle manufacturing, written by Aurélie Schoubben, Maurizio Ricci, and Stefano Giovagnoli, was originally published electronically on the publisher’s internet portal (currently SpringerLink) on 29 April 2019 without open access. With the author(s)’ decision to opt for Open Choice the copyright of the article changed on 23 September 2019 to © The Author(s) 2019 and the article is forthwith distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, duplication, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.