The answer to that question is no. No one has, because there's no model designed to effectively measure that.
Having said that, the interprovincial lottery organization has just put out an RFP to develop a modality for that.
I would challenge your statements that there are increased numbers of people with problems. When you measure it in Canada and around the world, the numbers don't change. I think we're becoming much more aware of the issues around gaming, just as society has become much more aware of the issues around a whole host of activities. Gaming is not a problem for 98%, or more, of the population. It's that small percentage you have to focus the research on, to find out how you can help. It's a question of someone having a problem with their on/off switch. Whether it's gaming, shopping, drinking, or anything, there are a certain number of people in society who do have problems around control.