I think it's important to be very specific when speaking about these things, because there seems to be a significant variation by place and time. You can't nece

I think it's important to be very specific when speaking about these things, because there seems to be a significant variation by place and time. You can't necessarily take a past study and generalize it to the present, nor can you necessarily take study from one country and apply it in another. The particular profession likely also plays a role.