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This may be linked to the adoption of specific recommendations and to the use of standard personal protective equipment by HCPs. To develop and validate a web-based self-diagnostic questionnaire on school food service offer aimed at food service managers (FSM) by (i) identifying relevant indicators of school food offer, developing a questionnaire and validating the concept using an expert panel; (ii) validating the questions by comparing the FSM's responses with observations by dietitians and (iii) undergoing a qualitative evaluation of the tool through dir