Let's be honest here, THE only unbiased way for any company to hire is Blind Interviews.
You know nothing about the persons Age, Race, Gender, Physical ability or looks until you give them the job.
THEN you find out what they are like as a "piece of meat" after they have the job based on their skills.
Nothing to do with their sex, size of breasts, colour of hair, what tattoo's they have and wear, colour of their hair, height, age, colour of skin, how they speak etc etc.. Nothing.
Until that is done, it will always be biased in some way based upon the views of the interviewers.