The sample size was calculated using the single population proportion formula by considering a 95% confidence interval (CI), 5% margin of error (d), proportion (P) 50%, and 1.5 of design effect. Considering 10% of the nonresponse rate, the final sample size 660 was obtained. A multistage sampling technique was used to select the study participants. Initially, the hospitals were stratified into primary, general, and referral hospitals. Accordingly, from each stratum, 2 primaries, 3 general, and 2 referral hospitals were selected using a simple random sampling technique. Based on the number of health professionals in each hospital, the total sample was proportionally allocated and each study participant was selected from the sampling frame using simple random sampling (lottery method).

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