valid option
valid predictors
valid questionnaires
valid responses
valid results
valid source

valid species
valid test
valid tool
valid way
validated food frequency questionnaire
validated HPLC method
validated instrument

validated instruments
validated measure
validated method
validated model
validated questionnaire
validated scoring system
validated target

validated tool
validation
validation analysis
validation cohort
validation criteria
validation data
validation data set

validation dataset
validation experiments