Ethics approval and consent to participate
cancer
ONCOLOGY, CANCER
The research was approved by the Research Ethics Committees of Mashhad University of Medical Sciences, Mashhad, Iran (no. IR.MUMS.NURSE.REC.1397.021). The approval was gained from the Director of Reza Radiotherapy and Oncology Center managers and head nurse. Before obtaining consent, researcher approached the patients and informed about the purpose, interventions, benefit, risk and outcome of the study. Upon obtained consent from the cancer patients, data was collected at baseline (before the intervention) and right after the last laughter yoga session. The questionnaire was administered by the same researcher. cancer patients were asked to respond to each item and upon completion, return this to the researcher. To maintain the confidentiality and privacy the identifying information was anonymized. The cancer patients were also informed that they can withdrew from the study at any time. All methods were performed in accordance with the relevant guidelines and regulations, which are aligned with the Declaration of Helsinki.