Regarding legalization- we had no relevant data, so I can't say. The bidirectional association may indeed indicate a third cause, as discussed in the paper. I h

Regarding legalization- we had no relevant data, so I can't say. The bidirectional association may indeed indicate a third cause, as discussed in the paper. I have added a link that should allow access to the full-text, let me know if it doesn't work for you.