Correction: Six minute walk distance and reference values in healthy Italian children: A cross-sectional study

• Matteo Vandoni,
• Luca Correale,
• Mariangela Valentina Puci,
• Christel Galvani,
• Roberto Codella,
• Fabio Togni,
• Antonio La Torre,
• Francesco Casolo,
• Alberto Passi,
• Claudio Orizio,
• Cristina Montomoli