TTN and familial dilated cardiomyopathy: Genetic counsellingFor all patients with DCM regardless of family screening (I-B)− When receiving a genetic testing (I-B)− By professionals trained in genetics (IIa-C)Genetic testing− Detection of truncating variant in titin gene (IIa-C)− Detection of lamin A/C gene variant (I-C) especially in patients with DCM associated with conduction disturbance