Association between severe childhood infections and subsequent risk of OCD is largely explained by shared familial factors - David Mataix-Cols; Lorena Fernández de la Cruz; Henrik Larsson; Paul Lichtenstein; Brian M D’Onofrio; Zheng Chang; Ralf Kuja-Halkola; Isabell Brikell; Josep Pol-Fuster; Jan C Beucke; Elles De Schipper (BMJ Mental Health)