1. Department of RespirologyGraduate School of MedicineChibaJapan
2. Department of PulmonologyVrije UniversiteitAmsterdamthe Netherlands
3. Department of RespirologyChibaken Saiseikai Narashino HospitalNarashinoJapan
4. Department of Cardiovascular SurgeryChiba UniversityChibaJapan
5. Department of Cardiovascular SurgeryEastern Chiba Medical CenterToganeJapan