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. 2019 Jul 4;14:130. doi: 10.1186/s13019-019-0952-5

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© The Author(s). 2019

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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Classification of multi-hole atrial septal defects. a Type A, Large-Small hole configuration accompanying small defect with different IDD. b Type B, Large-Moderate configuration accompanying small defects with different IDD. c Type C, cribriform formation, with the defect number of ≥5. d Type D, Moderate-Small-Moderate morphology, IDD ≥7 mm. (L = Large; S = Small; M = Moderate; IDD = Inter-defects Distance; Shadow = Central implanting defect; CS = coronary sinus)