In this poster, we describe partial findings from a larger study that explored the co-first and co-corresponding author phenomenon in two biomedical research areas, pharmacy and anesthesia. The top 10 journals in the two areas by the five-year impact factor as listed in 2013 JCR were used for the paper sources. A total of 17802 pharmacy papers and 35801 anesthesia papers were included in the analyses. Each paper was manually examined to identify the co-first and co-corresponding author papers. In this poster, we will show the distributions of the paper numbers and percentages of the co-first and co-corresponding papers over twenty years (1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014), the distributions of author numbers sharing the co-first and co-corresponding authorship, and the combinations and distributions of the authors' byline positions.

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