Thought I'd add my 2 cents...A looonnng time ago when I took my very first
college class - human behavior and development, the teacher drilled in to
our heads that the causes of behavior are Multiple, Complex and
Interrelated.  I've found this has applied to Everything ever since.  There
is probably no one cause for nipple confusion, just like there is no one
cause for sore nipples. etc...
I think because of Barbara's level of practice in her area, she sees very
complex cases, ditto for Linda and lots of others.  I've also seen what
Teresa describes too. We just have to all remember - multiple, complex,
interrelated - no ONE anything.  Sincerely, Pat in SNJ