Background Douyin APP is the short video APP with the largest number of users in China. Objective This study aimed to evaluate the quality and reliability of short videos about cosmetic surgery on Douyin. Methods In August 2022, we retrieved and screened 300 short videos related to cosmetic surgery from Douyin, extracted basic video information, encoded the content and identified the video source. The quality and reliability of short video information were evaluated using the DISCERN instrument. Results A total of 168 short videos of cosmetic surgery were included in the survey, and the video sources included personal accounts and institutional accounts. Overall, the total proportion of institutional accounts (47/168, 27.98%) is significantly less than that of personal accounts (121/168, 72.02%); nonhealth professionals received the most praises, comments and even collections and reposts, while for‐profit academic organizations or institutions received the least. The DISCERN scores of 168 short videos of cosmetic surgery were 3.74–4.58 (average 4.22). Content reliability ( p = .04) and overall short video quality ( p = .02) are significantly different, but short videos published from different sources have no significant difference in treatment selection ( p = .052). Conclusion The overall information quality and reliability of short videos about cosmetic surgery on Douyin are satisfactory in China. Patient or Public Contribution The participants were involved in developing research questions, study design, management and conduct, interpretation of evidence and dissemination.

Bromhidrosis, also known as body odor, is a common disease in life, which often occurs in young adults. The histological basis of bromhidrosis is the hyperplasia of apocrine sweat glands. 1 Surgical removal of apocrine sweat glands is the only radical cure for axillary osmidrosis at present. The core technology includes subcutaneous curettage, subcutaneous trimming, fusiform skin resection, swelling suction technology, and its comprehensive application. In recent years, various minimally invasive operations have been widely used.The combination of small incision, negative pressure suction technology, and high-speed rotary cutter has been applied because of complete removal of sweat glands, quick recovery, and few complications. It has been proved by our department to be an effective

Purpose The purpose of this paper is to study the variance risk premium in corn and soybean markets, where the variance risk premium is defined as the difference between the historical realized variance and the corresponding risk-neutral expected variance. Design/methodology/approach The authors compute variance risk premiums using historical derivatives data. The authors use regression analysis and time series econometrics methods, including EGARCH and the Kalman filter, to analyze variance risk premiums. Findings There are moderate commonalities in variance within the agricultural sector, but fairly weak commonalities between the agricultural and the equity sectors. Corn and soybean variance risk premia in dollar terms are time-varying and correlated with the risk-neutral expected variance. In contrast, agricultural commodity variance risk premia in log return terms are more likely to be constant and less correlated with the log risk-neutral expected variance. Variance and price (return) risk premia in agricultural markets are weakly correlated, and the correlation depends on the sign of the returns in the underlying commodity. Practical implications Commodity variance (i.e. volatility) risk cannot be hedged using futures markets. The results have practical implications for US crop insurance programs because the implied volatilities from the relevant options markets are used to estimate the price volatility factors used to generate premia for revenue insurance products such as “Revenue Protection” and “Revenue Protection with Harvest Price Exclusion.” The variance risk premia found implies that revenue insurance premia are overpriced. Originality/value The empirical results suggest that the implied volatilities in corn and soybean futures market overestimate true expected volatility by approximately 15 percent. This has implications for derivative products, such as revenue insurance, that use these implied volatilities to calculate fair premia.