GBD 2017 Inflammatory Bowel Disease Collaborators, Sudabeh Alatab, Sadaf G Sepanlou, Kevin Ikuta, Homayoon Vahedi, Catherine Bisignano, Saeid Safiri, Anahita Sadeghi, Molly R Nixon, Amir Abdoli, Hassan Abolhassani, Vahid Alipour, Majid A H Almadi, Amir Almasi-Hashiani, Amir Anushiravani, Jalal Arabloo, Suleman Atique, Ashish Awasthi, Alaa Badawi, Atif A A Baig, Neeraj Bhala, Ali Bijani, Antonio Biondi, Antonio M Borzì, Kristin E Burke, Félix Carvalho, Ahmad Daryani, Manisha Dubey, Aziz Eftekhari, Eduarda Fernandes, João C Fernandes, Florian Fischer, Arvin Haj-Mirzaian, Arya Haj-Mirzaian, Amir Hasanzadeh, Maryam Hashemian, Simon I Hay, Chi L Hoang, Mowafa Househ, Olayinka S Ilesanmi, Nader Jafari Balalami, Spencer L James, Andre P Kengne, Masoud M Malekzadeh, Shahin Merat, Tuomo J Meretoja, Tomislav Mestrovic, Erkin M Mirrakhimov, Hamid Mirzaei, Karzan A Mohammad, Ali H Mokdad, Lorenzo Monasta, Ionut Negoi, Trang H Nguyen, Cuong T Nguyen, Akram Pourshams, Hossein Poustchi, Mohammad Rabiee, Navid Rabiee, Kiana Ramezanzadeh, David L Rawaf, Salman Rawaf, Nima Rezaei, Stephen R Robinson, Luca Ronfani, Sonia Saxena, Masood Sepehrimanesh, Masood A Shaikh, Zeinab Sharafi, Mehdi Sharif, Soraya Siabani, Ali Reza Sima, Jasvinder A Singh, Amin Soheili, Rasoul Sotoudehmanesh, Hafiz Ansar Rasul Suleria, Berhe E Tesfay, Bach Tran, Derrick Tsoi, Marco Vacante, Adam B Wondmieneh, Afshin Zarghi, Zhi-Jiang Zhang, Mae Dirac, Reza Malekzadeh, Mohsen Naghavi