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. 2016 Dec 9;3:36. doi: 10.1186/s40634-016-0072-2

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© The Author(s). 2016

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. 1 — Ash and QCT equivalent density (a: dipotassium phosphate; b: calcium hydroxyapatite) relationships used in reviewed studies. Relationships from: ^a (Keyak et al. 1994) – 140 kVp, 70 mA; ^b (Les et al. 1994) – 140 kVp, 30 mA; ^c Unknown – used in (Eberle et al. 2013a, b); ^d (Keyak et al. 2005) – 80 kVp, 280 mAs