Losses were due to a combination of reasons: impossibility to survey a given COS when valid outlets in the updated frame were actually closed; frustrated attempts to complete the predefined interview number for a given shift, due to refusals or to the small number of people who have drunk in a given facility selling both alcoholic beverage and meals (for instance, during lunch time) or due to the fact that people did not actually leave the facility for the whole duration of a given shift.