Helmet Non-Invasive Ventilation for COVID-19 Patients (Helmet-COVID): study protocol for a multicentre randomised controlled trial by Yaseen M Arabi, Khalid Alghamdi, Eman Al Qasim, Fahad Al-Hameed, Haytham Tlayjeh, Mohammed Almaani, Zohair Al aseri, Sara Aldekhyl, Hasan M Al-Dorzi, Sheryl Ann Abdukahil, Mohammad Khulaif Al Harbi, Husain Al Haji, Mohammed Al Mutairi, Omar Al Zumai, Wedyan Al Wehaibi, Saad Al Qahtani, Jamal Chalabi, Mohammed Alshahrani, Talal Albrahim, Abdulrahman Alharthy, Ahmed Mady, Abdulhadi Bin Eshaq, Ali A Al bshabshe, Zainab Al Duhailib, Ayman Kharaba, Rakan Alqahtani, Adnan Al Ghamdi, Ali Altalag, Haifa Algethamy, Ahmad Al Aqeily, Faisal Al Baseet, Hashem Al Samannoudi, Mohammed Al Obaidi, Yassin T Ismaiel, Abdulrahman A Al-Fares

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