The aim of many experiments is to estimate the effect different interventions on subjects’ decision making. However, obtaining large samples and internal validity challenging. This paper presents an alternative device at almost no cost that can easily provide a very number participants (700 in 1 hour). We asked 14 students invite their WhatsApp contacts participate online experiment. created to...

abstract   objective: to determine the prevalence of helicobacter pylori (h. pylori) infection in patients with gastrectomy for gastric cancer. material and methods: samples from 95 (69 males, 26 females) consecutive patients who had undergone surgery for gastric cancer were included in this study. histologic examination of tumor obtained at the time of surgery yielded the diagnosis and then th...