Try a search of  the Archives: Marsha Walker and I had a discussion about
it a few months back.
Jane Heinig from UC Davis has an Independent Study module for approx $32
(US) which is excellent. 
Their web address is http://lactation.ucdavis.edu
It  takes about 2 hours to read and complete for 2.2 L CERPS.
Hope this helps.

Sincerely, 
Elaine Mazgelis, RD, IBCLC
Cambridge-Somerville WIC
Massachusetts, USA

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