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. 2018 Oct 9;34(3):496–502. doi: 10.1007/s00380-018-1254-x

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 2 — Overall TTI observation rate and per vein depending on spiral mapping catheter. Using the SMC2 leads to significantly higher overall TTI observation rate and in the LIPV and RIPV, whereas TTI observation rate of the upper PV was comparable in the SMC1 and SMC2 group