Yes, I decided to buy the DSM-5 when taking an Abnormal Psychology course. It is very helpful. That's good that the update is available online.
I'm not certain if "atypical" is a new description. I never read the DSM-IV. I know that the way the specifiers are used is new compared to in the DSM-IV. I've seen a bit of the coding, but would need to learn more.
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