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Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Luciano Seta wrote the paper, reviewed drafts of the paper.

Antonella Chifari wrote the paper, reviewed drafts of the paper.

Onofrio Di Giuseppe web designer.

Paola Denaro management.

Manuela Ferreira wrote the paper, reviewed drafts of the paper.

Miguel A. Santos wrote the paper, reviewed drafts of the paper.

Funding

This work was carried out within the WHAAM Project, with support from the Lifelong Learning Programme 2007-2013, Transversal Programme - Key Activity 3. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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