“Endogenous serotonin system does not participate in the withdrawal opiate, but its inhibition by stimulation 5-HT1A receptor increases the effectiveness of the clonidine in rats / El sistema endógeno de serotonina no participa en la abstinencia opiácea. ”. (2003) Health and Addictions/Salud y Drogas, 3(1). doi:10.21134/haaj.v3i1.150.