**Acknowledgements**

The authors would like to acknowledge Maurizio Luisetti, MD, a dear friend who was a medical director at the Clinic of Respiratory Diseases, IRCCS Policlinico San Matteo (Pavia, Italy) for 20 years. He passed away on Monday, Oct. 20, 2014 at age 61. Besides his outstanding competence, Maurizio was a person with extraordinary humanity and commitment toward his patients and coworkers with whom he was always friendly and ready to help and cooperate. Thank you, Maurizio, for all you have done and all you have given us in these years. You are still sadly missed.

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