Suppose you would like to assess the association between physicians' self-assessed burnout (measured as a response to the prompt "I feel burned out from my work" using a 6-point Likert-type scale: Every day; A few times a week; Once a week; A few times a month; Once a month; A few times a year) and the cost of their provided care (measured as a sum of all billed care over the course of 30 days by each physician included in the study). For what confounders should you control in a regression model quantifying this association? Give at least 2 examples.

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