The correct reference is:
Berta Moreno-Küstner, Ingeborg Warnke, Carlos Nordt, Gemma Fernandez, José Ramos, Pedro Paulino-Matos, Wulf Rössler, Graça Cardoso
Predictors of repeat visits to hospital psychiatric emergency departments in Malaga (Spain) and in Lisbon (Portugal)
doi: 10.1136/emermed-2015-205214. Epub 2017 Jul 18.. 2017 Oct;34(10):665-671.Emerg Med J