أرسل هذا في رسالة قصيرة: Cost effectiveness analysis of population-based serology screening and 13C-Urea breath test of Helicobacter pylori to prevent gastric cancer: A Markov model

  ____      ______   ______      ___     _    _   
 |  _ \\   /_   _// |      \\   / _ \\  | |  | || 
 | |_| ||   -| ||-  |  --  //  / //\ \\ | |/\| || 
 | .  //    _| ||_  |  --  \\ |  ___  |||  /\  || 
 |_|\_\\   /_____// |______// |_||  |_|||_// \_|| 
 `-` --`   `-----`  `------`  `-`   `-` `-`   `-`