I think dhi is just a marketing gimmick. The majority of people for some reason are under the assumption grafts die if they are out of the body a couple of hours. It’s just a clever way of giving uneducated HT people the idea that they can get a better result through this method. Usually low cost budget clinics offer dhi. Look at the top docs like Konior, diep, Hasson, Wong, none of them are doing dhi