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© 2018 {Academia Publishing Group}, All rights reserved. This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. Licensed under 
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. a Creative Commons Attribution 4.0 International License.
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. a Creative Commons Attribution 4.0 International License.