發送短信 : Assessment of Contamination and Misclassification Biases in a Randomized Controlled Trial of a Social Network Peer Education Intervention to Reduce HIV risk Behaviors Among Drug Users and Risk Partners in Philadelphia, PA and Chiang Mai, Thailand

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