Recently, Jimmy Atkinson at Web Health Blog told me about open access courses on health and medical topics.
These seminars and courses are free for anyone to use. Although they do not provide credits, they can become valuable resources in your goal to become more aware of national and international health and medical issues
The courses also include good courses by for example Harvard Medical School, Johns Hopkins Bloomberg School of Public Health, MIT and TUFTS. You will find good courses in epidemiology and statistics.
Please visit their website to read bout the available courses.