Guías clínicas erradas (más del 50%): peor las de sociedades médicas de especialistas (contra agencias nacionales). *Wrong guidelines (around 50%): of lower quality, guidelines sponsored by medical specialty societies.* http://ebm.bmj.com/content/early/2016/12/16/ebmed-2016-110606.full -un saludo juan gérvas, @JuanGrvas MD, PhD retired rural GP, visiting professor National School of Public Health (Dep of International Health, Madrid-Spain), visiting professor (1991-2003) Johns Hopkins School of Public Health (Dep of Health Policy and Management, Baltimore-USA)