 A 2014 study in the "Journal of the American Pharmacists Association" examined 19 Wikipedia articles about herbal supplements, and concluded that all of these articles contained information about their "therapeutic uses and adverse effects", but also concluded that "several lacked information on drug interactions, pregnancy, and contraindications".The study's authors therefore recommended that patients not rely solely on Wikipedia as a source for information about the herbal supplements in question.Another study published in 2014 in "PLOS ONE" found that Wikipedia's information about pharmacology was 99.7% accurate when compared to a pharmacology textbook, and that the completeness of such information on Wikipedia was 83.8%.