Too many to list: Several dozen are commonly found. The complexity will be apparent to you as you review http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1287824/
Answered 12/24/2014
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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