Is the ASA Classification Universal?

1. Department of Anesthesiology, Centro Hospitalar Universita´rio de Sa˜o Joa˜o, Porto, Portugal

2. Department of Anesthesiology, Instituto Portugueˆs de Oncologia Do Porto Francisco Gentil, EPE, Porto, Portugal

3. Department of Anesthesiology, Faculdade de Medicina da Universidade Do Porto, Porto, Portugal