1. Low-income countries are defined as those with per capita incomes of $755 or less, middle-income countries are those with incomes between $756 and $9265, and high income countries are those with incomes of $9266 or more. See www.worldbank.org/data/databytopic/class.htm
2. Improving the health of the global poor;Jha;Science,2002
3. www.globalhealth.gov/quotes.shtml#globalconcern
4. The pursuit of global health;Howson;Lancet,1998
5. Enter the physician-executive;Shaywitz;Boston Globe,2002