Who is more prone to mental illness?

I really don't want an all out gender war. We were having this discussion earlier in class. In my opinion, it seems we are both just as prone but men for the life of them will never say they are depressed, bipolar, schizophrenic, etc. so the general idea has always been women are more prone. What do you think?
Men
Women
Neither
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Who is more prone to mental illness?
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