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    Carruthers, J., Brin, M. F., De Boulle, K., Liew, S., Carruthers, A., Rivkin, A., Wu, Y., Yushmanova, I., Boodhoo, T. I., Zhuang, K., Gallagher, C. J., & Lee, E. (n.d.). safety and tolerability of onabotulinumtoxinA in the treatment of facial lines: Statistical meta-analysis of pooled data from global registration studies of treatment of crow's feet lines and glabellar lines in more than 3900 participants. Toxicon, 123, S11–S12. http://access.bl.uk/ark:/81055/vdc_100039991331.0x000028