3599434 muQFR Murray law-based quantitative flow ratio 32 3599435 muQFR Murray law-based QFR 10 3599437 muQFR Murray fractal law-based QFR 1 3599436 muQFR Murray law QFR 1 3599433 muQFR Murray law-based angiographic quantitative flow ratio 1 3599432 muQFR Murry law based single view quantitative flow reserve 1