3049473 MPFA multiple-probability fluctuation analysis 5 3049471 MPFA medial proximal femoral angle 3 3049466 MPFA multipoint flux approximation 2 3049472 MPFA medial patellofemoral angle 1 3049470 MPFA metasurface polarization filter array 1 3049469 MPFA methyl phosphonofluoridic acid 1 3049468 MPFA most plausible factual account 1 3049467 MPFA multi-position fusion architecture with position metadata 1