ORIGINAL ARTICLE: Efficacy of C1-C2 Sustained Natural Apophyseal Glide (SNAG) Versus Posterior Anterior Vertebral Mobilization (PAVMs) in the Management of Cervicogenic Headache. (2014). Journal of Basic & Applied Sciences, 10, 226-230. https://doi.org/10.6000/1927-5129.2014.10.31