2176175 QTOF-MS quadrupole time-of-flight mass spectrometry 232 2176193 qTOF-MS quadrupole high-resolution time of flight mass spectrometry 5 2176187 QTOF-MS quadrupole time-of-flight high resolution mass spectrometry 2 2176192 QTOF-MS (ESI)-quadrapole/time of flight hybrid mass spectrometer 1 2176191 QTOF-MS QTof mass spectrometer 1 2176188 QTOF-MS quadrupole time of flight MS 1 2176194 QTOF-MS UHPLC-Quadrupole Time-Of-Flight Mass Spectrometry 1