Many types: There are literally dozens of books on this topic.Check out a bookstore,and leaf through them to find the one that makes the most sense to you.
Answered 8/10/2014
3.8k views
A doctor has provided 1 answer
15 doctors weighed in across 3 answers
8 doctors weighed in across 3 answers
6 doctors weighed in across 2 answers
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question