After his Borg assimilation, Captain Picard appeared to be 100% restored to his original human self. But was that the case? (This question is purely about his physical restoration, I'm not interested here in e.g. any psychological damage).

Specifically, I'd like to know:

1. Did the Borg (eeeek) remove any of Picard's body?
2. Was Picard left with any Borg implants?

I remember him (after being restored to human) being recognized by a Borg as one of them. And I seem to remember him still being able to hear their voices, but can't be sure of that.