Registre de correu electrònic: Retraction: Randomised clinical trial: The clinical efficacy and safety of an alginate‐antacid (Gaviscon Double Action) versus placebo, for decreasing upper gastrointestinal symptoms in symptomatic gastroesophageal reflux disease (GERD) in China by J. Sun, C. Yang, H. Zhao, P. Zheng, J. Wilkinson, B. Ng, Y. Yuan. Aliment Pharmacol Ther. 2015;42:845‐854.