bfr-stats Blood Flow Restriction Stats HPF parser reference https://github.com/jogrundy/Read_QuickDAQ_.hpf/blob/master/read_hpf.py https://github.com/abougouffa/m2hpf https://github.com/abougouffa/m2hpf/blob/master/high_performance_file_format_spec.pdf https://github.com/abougouffa/m2hpf/blob/master/def/HPFFile.def https://github.com/douglasgscofield/HPF https://www.netlib.org/hpf/