We approached 2100 emergency physic

We approached 2100 emergency physicians from
4 countries (Australia, Canada, the United Kingdom and the
United States) to participate in our survey by sampling the
membership of their emergency associations. We used a
modified Dillman technique with 3–5 notifications and a
prenotification letter employing a combination of electronic
mail and postal mail. Physicians were questioned about neurologically
intact patients who presented with headache.
Analysis included both descriptive statistics for the entire
sample and stratification by country.