أرسل هذا في رسالة قصيرة: Risk of second primary cancer among patients with head and neck cancers: A pooled analysis of 13 cancer registries

  _____    _    _     _____      ___     ______   
 |__  //  | || | ||  / ____||   / _ \\  |      \\ 
   / //   | || | || / //---`'  | / \ || |  --  // 
  / //__  | \\_/ || \ \\___    | \_/ || |  --  \\ 
 /_____||  \____//   \_____||   \___//  |______// 
 `-----`    `---`     `----`    `---`   `------`