Scalable psychological interventions for Syrian refugees in Europe and the Middle East: STRENGTHS study protocol for a prospective individual participant data meta-analysis oleh Pim Cuijpers, Kenneth Carswell, Ceren Acarturk, Martha Bird, Zeynep Ilkkursun, Marit Sijbrandij, Ersin Uygun, Bayard Roberts, Richard Bryant, Egbert Sondorp, David McDaid, Christine Knaevelsrud, Mark J D Jordans, A-La Park, Aemal Akhtar, Ulrich Schnyder, Sebastian Burchert, Trudy Mooren, Anke B Witteveen, Peter Ventevogel, Anne M de Graaff, Mhd Salem Alkneme, May Aoun, Manar Awwad, Ahmad Y Bawaneh, Felicity L Brown, Annelieke Drogendijk, Michelle Engels, Daniela C Fuhr, Pernille Hansen, Edith van 't Hof, Luana Giardinelli, Mahmoud Hemmo, Jonas M Hessling, Nikolai Kiselev, Gülsah Kurt, Saara Martinmäki, Naser Morina, Hadeel Naser, Monique C Pfaltz, Matthis Schick, Julia Spaaij, Frederik Steen, Karine Taha, Claire Whitney, Martine van den Dool, Cansu Mirzanlı, Nana Wiedemann, Aniek Woodward