Apples and oranges, a qualitative comparison: http://improb.com/airchives/paperair/volume1/v1i3/air-1-3-apples.html">http://improb.com/airchives/paperair/volume1/v1i3/air-1-3-apples.html
follow up study:
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1120087#B1">http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1120087#B1

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