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. 2020 Sep 10;9(2):615–626. doi: 10.1007/s40122-020-00194-0

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License, which permits any non-commercial use, sharing, 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by-nc/4.0/.

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Fig. 1 — Map of the back of the head with the line connecting the external acoustic meati and the external occipital protuberance (MOP line) highlighted in green. Above the MOP line are areas R1 to R4, below areas R5 to R8