Piña, J.A., Dávila, M., Lozano, D.I., Carillo, I.C. and Vázquez, P. 2009. Relationship with multiple partners in university women: a comparative study in two institutions from the northwest of Mexico. Colombia Medica. 40, 1 (Dec. 2009), 51–70. DOI:https://doi.org/10.25100/cm.v40i1.628.