Electronic patient records, paperless report transfer, online pharmacies, and cyber operations - information technologies, especially the internet, are revolutionizing healthcare and may provide solutions to the cost issues in medical care. Grounded for medical professionals and easily understandable for laypeople, the book illustrates what is already feasible today and what may be possible tomorrow. It offers a compact, interdisciplinary overview of all trends and developments, opportunities and risks, along with illustrative case studies that highlight concrete practical perspectives in e-health.