Table 1 Primary disease of all patients

Parkinson disease

8

Parkinson disease

5

hypopharyngeal cancer

6

cerebral infarction

3

cerebral infarction

5

multiple system atrophy

3

multiple system atrophy

4

amyotrophic lateral sclerosis

2

amyotrophic lateral sclerosis

2

chordoma

1

laryngeal cancer

2

dementia

1

oropharyngeal cancer

2

encephalomyelitis

1

progressive supranuclear palsy

2

COPD

1

Wallenberg syndrome

2

Gaucher disease

1

Alzheimer

1

myasthenia gravis

1

aortic aneurysm

1

pneumonia

1

asthma

1

recurrent laryngeal nerve palsy

1

dementia

1

dermatomyositis

1

maxillary cancer

1

mitochondrial myopathy

1

motor neuron disease

1

muscular sarcoidosis

1

myasthenia gravis

1

myotonic dystrophy

1

pontine infarction

1

recurrent laryngeal nerve palsy

1

schizophrenia

1

spinocerebellar degeneration

1

thalamic hemorrhage

1