* Diet<ref name="dietandacne">{{cite journal|author1=Elsa H. Spencer|author2=Hope R. Ferdowsian|author3=Neal D. Barnard|orig-year=19 March 2009|title=Diet and acne: a review of the evidence|url=https://onlinelibrary.wiley.com/doi/full/10.1111/j.1365-4632.2009.04002.x|edition=International Journal of Dermatology|publisher=The International Society of Dermatology|publication-date=19 March 2009|doi=10.1111/j.1365-4632.2009.04002.x|access-date=28 January 2019|journal=International Journal of Dermatology|year=2009|volume=48|issue=4|pages=339–347|pmid=19335417|s2cid=16534829| issn=0011-9059 }}</ref> | * Diet<ref name="dietandacne">{{cite journal|author1=Elsa H. Spencer|author2=Hope R. Ferdowsian|author3=Neal D. Barnard|orig-year=19 March 2009|title=Diet and acne: a review of the evidence|url=https://onlinelibrary.wiley.com/doi/full/10.1111/j.1365-4632.2009.04002.x|edition=International Journal of Dermatology|publisher=The International Society of Dermatology|publication-date=19 March 2009|doi=10.1111/j.1365-4632.2009.04002.x|access-date=28 January 2019|journal=International Journal of Dermatology|year=2009|volume=48|issue=4|pages=339–347|pmid=19335417|s2cid=16534829| issn=0011-9059 }}</ref> |