 A random sample of 300 neurologists prescribing anti-epileptic drug AEDs and who have been sent the TrobaltTM Physicians Guide. A sample of 200 neurologists will be recruited from across the same eight countries, with up to 100 neurologists from Germany. The recruitment will be from among those who have prescribed an AED at least once in the last 3 months, and who were on the list to which a letter including the Physicians Guide TrobaltTM was distributed. The survey will aim to recruit at least 75 physicians from the seven specified countries and 50 physicians from Germany with experience of prescribing TrobaltTM for sub-analyses, as these individuals would be expected to be more aware of the risks of TrobaltTM. 