I know that. I'm commenting on the idea that collaborative is efficient, but physician- only is not. If CRNAs are doing their cases independently, and physicians are doing their cases independently, then it is not any more efficient than of they were all physicians doing their own cases. I would actually argue that it is less efficient, given CRNAs have substantially less experience with blocks, lines, prepping sick patients solo than physicians do. I saw this in the Army all the time. I could block my own patients between cases, but if a CRNA wanted to do their own block, they'd need to have someone get them out from the room (who then finished the case for them) while they struggled with the block, and still sometimes delayed the start of the next case.