title: When calculation of minimum sample size is not justified: When sample size calculation is not justified.
authors.affiliation: Research Center for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, IR Iran.
authors.forename: Mohamad Amin
authors.initials: MA
authors.lastname: Pourhoseingholi
authors.forename: Ahmad Reza
authors.initials: AR
authors.lastname: Baghestani
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