First of all, thank you for sharing this interesting article with us, donfelix. It was interesting information to read. About the depression question, I remember reading some research that says in some regions, people have more problems with depression/anxiety or need professional help/counseling for couples regarding marriage. I think they are pretty true because the pressure of the atmosphere in some regions can affect the human brain. If you find any information about this topic, please share it here. http://counsellinginmelbourne.com.au/everything-you-need-to-know-about-relationship-counselling