Table 1.

Described information for the data collection conducted in Spain, Colombia and Bolivia

	Spain	Colombia	Bolivia
Sampling universe	356 physicians from hospitals, health care services and research centres of the Canary Islands Health Service	184 physicians affiliated to the Society of Surgery Service, San José Hospital of Bogotá	350 physicians from hospitals and health care centres in Sucre
Sample	113	118	279
Interview	Self-administered questionnaire	Self-administered questionnaire	Self-administered questionnaire
Margin of error	7.6% p = q = 95% confidence level	5.4% p = q = 95% confidence level	2.7% p = q = 95% confidence level
Fieldwork	January to June 2012	February to April 2012	August to September 2011