title: Reply: Externalities and citation practices.
authors.affiliation: Department of Preventive Medicine and Public Health, University of Santiago de Compostela, Santiago de Compostela, A Coruña, Spain; CIBER de Epidemiología y Salud Pública, CIBERESP, Madrid, Spain. Electronic address: alberto.ruano@usc.es.
authors.forename: Alberto
authors.initials: A
authors.lastname: Ruano-Ravina
authors.affiliation: CIBER de Epidemiología y Salud Pública, CIBERESP, Madrid, Spain; Public Health Research Group, University of Alicante, Alicante, Alicante, Spain.
authors.forename: Carlos
authors.initials: C
authors.lastname: Álvarez-Dardet
authors.affiliation: Subdirectorate-General for Health Promotion and Prevention, Madrid Regional Health Authority, Madrid, Spain.
authors.forename: María F
authors.initials: MF
authors.lastname: Domínguez-Berjón
authors.affiliation: Tobacco Control Unit, Institut Català d'Oncologia, Barcelona, Catalonia, Spain; Department of Clinical Sciences, School of Medicine, Campus de Bellvitge, Universitat de Barcelona, Barcelona, Catalonia, Spain.
authors.forename: Esteve
authors.initials: E
authors.lastname: Fernández
authors.affiliation: CIBER de Epidemiología y Salud Pública, CIBERESP, Madrid, Spain; Department of Preventive Medicine and Public Health, University of Valencia, Valencia, Valencia, Spain.
authors.forename: Ana M
authors.initials: AM
authors.lastname: García
authors.affiliation: CIBER de Epidemiología y Salud Pública, CIBERESP, Madrid, Spain; Agència de Salut Pública de Barcelona, Barcelona, Catalonia, Spain.
authors.forename: Carme
authors.initials: C
authors.lastname: Borrell