Systematic review and pooled analysis of randomized controlled trials in countries of the Gulf Cooperation Council (GCC)

From the Department of Primary Health Care (Alraddadi, Al-Adwani), National Guard Health Affairs, King Saud bin Abdulaziz University for Health Sciences; from the Department of Community Medicine (Al-Raddadi, Ramadan), and from the Department of Family Medicine (Alamri), Faculty of Medicine, King Abdulaziz University; from the Department of Otolaryngology–Head and Neck Surgery (Mirza), Faculty of Medicine in Rabigh, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia; from the Department of Community Medicine (Ramadan), Faculty of Medicine, Al-Azhar University, Cairo, Egypt; and from the Department of Otolaryngology–Head and Neck Surgery (Mirza), Temerty Faculty of Medicine, University of Toronto, Toronto, Canada.

From the Department of Primary Health Care (Alraddadi, Al-Adwani), National Guard Health Affairs, King Saud bin Abdulaziz University for Health Sciences; from the Department of Community Medicine (Al-Raddadi, Ramadan), and from the Department of Family Medicine (Alamri), Faculty of Medicine, King Abdulaziz University; from the Department of Otolaryngology–Head and Neck Surgery (Mirza), Faculty of Medicine in Rabigh, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia; from the Department of Community Medicine (Ramadan), Faculty of Medicine, Al-Azhar University, Cairo, Egypt; and from the Department of Otolaryngology–Head and Neck Surgery (Mirza), Temerty Faculty of Medicine, University of Toronto, Toronto, Canada.

From the Department of Primary Health Care (Alraddadi, Al-Adwani), National Guard Health Affairs, King Saud bin Abdulaziz University for Health Sciences; from the Department of Community Medicine (Al-Raddadi, Ramadan), and from the Department of Family Medicine (Alamri), Faculty of Medicine, King Abdulaziz University; from the Department of Otolaryngology–Head and Neck Surgery (Mirza), Faculty of Medicine in Rabigh, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia; from the Department of Community Medicine (Ramadan), Faculty of Medicine, Al-Azhar University, Cairo, Egypt; and from the Department of Otolaryngology–Head and Neck Surgery (Mirza), Temerty Faculty of Medicine, University of Toronto, Toronto, Canada.

From the Department of Primary Health Care (Alraddadi, Al-Adwani), National Guard Health Affairs, King Saud bin Abdulaziz University for Health Sciences; from the Department of Community Medicine (Al-Raddadi, Ramadan), and from the Department of Family Medicine (Alamri), Faculty of Medicine, King Abdulaziz University; from the Department of Otolaryngology–Head and Neck Surgery (Mirza), Faculty of Medicine in Rabigh, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia; from the Department of Community Medicine (Ramadan), Faculty of Medicine, Al-Azhar University, Cairo, Egypt; and from the Department of Otolaryngology–Head and Neck Surgery (Mirza), Temerty Faculty of Medicine, University of Toronto, Toronto, Canada.

From the Department of Primary Health Care (Alraddadi, Al-Adwani), National Guard Health Affairs, King Saud bin Abdulaziz University for Health Sciences; from the Department of Community Medicine (Al-Raddadi, Ramadan), and from the Department of Family Medicine (Alamri), Faculty of Medicine, King Abdulaziz University; from the Department of Otolaryngology–Head and Neck Surgery (Mirza), Faculty of Medicine in Rabigh, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia; from the Department of Community Medicine (Ramadan), Faculty of Medicine, Al-Azhar University, Cairo, Egypt; and from the Department of Otolaryngology–Head and Neck Surgery (Mirza), Temerty Faculty of Medicine, University of Toronto, Toronto, Canada.

From the Department of Primary Health Care (Alraddadi, Al-Adwani), National Guard Health Affairs, King Saud bin Abdulaziz University for Health Sciences; from the Department of Community Medicine (Al-Raddadi, Ramadan), and from the Department of Family Medicine (Alamri), Faculty of Medicine, King Abdulaziz University; from the Department of Otolaryngology–Head and Neck Surgery (Mirza), Faculty of Medicine in Rabigh, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia; from the Department of Community Medicine (Ramadan), Faculty of Medicine, Al-Azhar University, Cairo, Egypt; and from the Department of Otolaryngology–Head and Neck Surgery (Mirza), Temerty Faculty of Medicine, University of Toronto, Toronto, Canada.