Here are the links or the articles

http://www.nepjol.info/index.php/JoNMC/article/viewFile/7296/5912

http://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0117999&type=printable

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4803976/

http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0078412

The other 2 article are attaced

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