Data were collected using a standardized, structured, and face-to-face interviewer-administered questionnaire. The questionnaire includes the patient's sociodemographic characteristics, clinical features of patients, lifestyle and behavior of patients, and nutritional status which include the anthropometric examination and biochemical test. Data were collected by six trained B.Sc., Nurse and three trained medical laboratory technology with fluency in the local language (Amharic). Orientation, supervision, and reviewing the completed questionnaire were done to assure data quality. The data collectors measured the patient's preoperative nutritional status (BMI and serum albumin level) and followed postoperative wound healing progress with clinical features.

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