Fig. 2.

Flow diagram of participant selection for analysis. *In this study, the participants submitted a set of the questionnaires three times (May, October, and February). ‘Observation’ number indicates the number of analyzed questionnaires: if all questionnaires had been submitted, ‘observation’ would have been equal to triple the number of participants. However, as some questionnaires were missing in October and February, ‘observation’ is less than triple