Nevertheless, true regional differences do exist, especially with regard to certain MG subgroups, for example, MG with antibodies against muscle‐specific tyrosine kinase (MuSK + MG), which is more common in Southern Europe than in Northern Europe (Niks, Kuks, & Verschuuren, 2007; Tsiamalos, Kordas, Kokla, Poulas, & Tzartos, 2009). Here, MUSK is linked to myasthenia gravis.