MUSK and myasthenia gravis: 58.1% of patients were positive for acetylcholine receptor antibodies (AChR‐ab), followed by seronegative MG patients (22.7%), muscle‐specific tyrosine kinase (MuSK)‐ab (6%), and low‐density lipoprotein receptor‐related protein 4 (LRP4)‐ab (2.7%); in 17.4%, the ab‐status was unknown.