COL11A1 and Stickler syndrome type 2: A smaller proportion of AD cases are caused by heterozygous pathogenic variants in COL11A1 (Stickler Syndrome Type II [STL2]), and COL11A2 (Otospondylomegaepiphseal dysplasia, AD [OSMEDA], formerly known as Non-Ocular Stickler Syndrome) [7,8,13,14].