發送短信

數:

提供者:

CAPTCHA:

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

Please enter what you see:

發送短信 : Geographical variation in ambulance calls is associated with socioeconomic status