{'fraction_non_alphanumeric': 0.02443609022556391, 'fraction_numerical': 0.05451127819548872, 'mean_word_length': 5.056818181818182, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Fourth International Joint Meeting on Thoracic Surgery, Barcelona 2018.

As Guest Editors, it is our great pleasure to preface the focused issue of the Journal of Thoracic Disease ( JTD ), dedicated to the 4th International Joint Meeting on Thoracic Surgery, held in Barcelona on 28th–30th November 2018. The rewarding experiences of the prior three editions (2009, 2012 and 2015) of this International Meeting on Thoracic Surgery encourage us to work together once again with the purpose of celebrating this fourth edition in 2018.