LRRK2 and Platelet storage pool disease: This environmental contribution would be expectable for sPD (Feil & Fraga, 2011), but the age‐dependent reduced penetrance of the LRRK2 G2019S mutation together with its identification not only in monogenic but also in sPD cases (Healy et al, 2008) could also support an environmental involvement in L2PD (Farrer, 2006; Urdinguio et al, 2009).