Background and Objectives: Randomized clinical trials are the gold standard for evaluating the effectiveness and safety of medical interventions. Some unpredictable challenges may affect the results of these studies. Therefore, the aim of this study was to identify the challenges of clinical trial studies in different stages including design, conduct, analysis, and reporting.   Methods: This ...

this page was created using nitro pdf trial software. to purchase, go to http://www.nitropdf.com/ this page was created using nitro pdf trial software. to purchase, go to http://www.nitropdf.com/ this page was created using nitro pdf trial software. to purchase, go to http://www.nitropdf.com/ this page was created using nitro pdf trial software. to purchase, go to http://www.nitropdf.com...

Background and Aim: Randomized controlled clinical trial is the most valid type of epidemiological studies for the treatment of diseases. The aim of the present article is to determine the subject area, type of intervention, and blinding methods used in this type of study design. Materials and Methods: This is a cross-sectional descriptive study in which all the articles based on randomized c...

Background & Aim: Randomized clinical trials (RCTs) are studies which are able to provide the most valid evidence to compare various interventions in health research. Biases can affect the quality of research and ultimately make the results of a study invalid. One of the most important biases is selection bias. The best way to reduce selection bias is the use of random allocation. The aim of th...