-The basics of query, such as research; participation in the questionnaire do not know, intelligence, medical, nutrition info
- Other factors that are beyond the specified time, such as in eating, quantity, Nutrients and nutritional value of food (which each person eating breakfast in a different category and quantity)
-behaviour or behavior many of those who answered the questionnaire
.-Not clear of questions or a question in each verse with similar meaning. Cause suspicion and wrong answer
- Etc.
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