About the Authors
GoLP/Instituto de Plasmas e Fusão Nuclear-Laboratório Associado, Instituto Superior Técnico, Lisbon, Portugal
Visual Sciences Research Centre, University of Lisbon, Lisbon, Portugal
Hospital da Luz, Lisbon, Portugal
The authors have declared that no competing interests exist.
Conceived and designed the experiments: FJR ACD JMD. Performed the experiments: FJR. Analyzed the data: FJR. Contributed reagents/materials/analysis tools: ACD JMD. Wrote the paper: FJR. Gave technical support and conceptual advice: ACD JMD. Supervised the project: ACD JMD.