From the WSJ blog: 

If companies are looking for gender bias in their workplace, here’s one place they may want to start: feedback.

Research suggests that men and women are assessed very differently at work. Specifically, managers are significantly more likely to critique female employees for coming on too strong, and their accomplishments are more likely than men’s to be seen as the result of team, rather than individual efforts, finds new research from Stanford University’s Clayman Institute for Gender Research. Those trends appear to hold up whether the boss making the assessments is male or female.