8/4/2019 Lit Hop a Ed Ion

1/4

http://www.jstor.org/page/info/about/policies/terms.jsphttp://www.jstor.org/stable/25355788?origin=JSTOR-pdfhttp://www.jstor.org/action/showPublisher?publisherCode=bmj

8/4/2019 Lit Hop a Ed Ion

2/4

8/4/2019 Lit Hop a Ed Ion

3/4

8/4/2019 Lit Hop a Ed Ion

4/4