15 Remedios Naturales para el Dolor de Espalda

2 6 12 CNN May 25, 2014

3 Annals of Internal Medicine January 3, 2012 vol. 156 no. 1 Part 1 1-10

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5 Annals of Family Medicine March 2013; 11(2):122-9

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21 BMJ 2014;349:g4424

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24 Journal of Pain, Cannabis studies