Abstract Background Assessing the long term effects of many surgical interventions tested in pragmatic RCTs may require extended periods of participant follow-up to assess effectiveness and use patient-reported outcomes that require large sample sizes. Consequently the RCTs are often perceived as being expensive and time-consuming. particularly if the results show the test interventio... https://www.chiggate.com/3m-speedglas-9002nc-welding-helmet-fashion/