> Is this a technique that went out of vogue since my childhood I think it's just as likely that maybe the knowledge is unevenly distributed, and if a doctor a

> Is this a technique that went out of vogue since my childhood I think it's just as likely that maybe the knowledge is unevenly distributed, and if a doctor at the hospital is aware of it then it may spread, but may not spread beyond that hospital easily. It also may not spread until there are cases that benefit from it so other doctors can observe or hear about it. Just like in software engineering, there are things that are taught, and then there are things that are learned over time, imparted by a mentor, or spread through a group. Doctors seem to have a better handle on this, as they do residencies to learn a lot of the practical skills that are hard to teach in a classroom, but that does probably lead to those skills learned in residency being fairly variable.