"Drug Safety Update". Medicines and Healthcare products Regulatory Agency. May 2012. Diarsipkan dari asli tanggal 4 June 2012. Diakses tanggal 22 January 2013.
"Drug Safety Update". Medicines and Healthcare products Regulatory Agency. May 2012. Diarsipkan dari asli tanggal 4 June 2012. Diakses tanggal 22 January 2013.