Correction: Disseminated synovial chondromatosis of the knee treated by open radical synovectomy using staged combined anterior and posterior approaches: a case report - Sileshi Serebe Zeleke; Koyachew Abate Nigussie; Yeab Mulat Mesfin; Wodage Mesele Fentie; Michael Stein; Daniel Kassie Molla (Journal of Medical Case Reports)