The Karma system is currently undergoing maintenance (Monday, January 29, 2018).
The maintenance period has been extended to 8PM EST.

Karma Credits will not be available for redeeming during maintenance.

A Web-Based Intervention for Health Professionals and Patients to Decrease Cardiovascular Risk Attributable to Physical Inactivity: Development Process

Barbara Sassen, Gerjo Kok, Ilse Mesters, Rik Crutzen, Anita Cremers, Luc Vanhees

JMIR Res Protoc 2012 (Dec 14); 1(2):e21
Full Text: HTML PDF