Table:
Exploding head syndrome
Other names	Episodic cranial sensory shock,[1] snapping of the brain,[2] auditory sleep start[3]
Specialty	Sleep medicine
Symptoms	Hearing loud noises when falling asleep or waking up[2]
Duration	Short[2]
Causes	Unknown[3]
Differential diagnosis	Nocturnal epilepsy, hypnic headaches, nightmare disorder, PTSD[2]
Treatment	Reassurance, clomipramine, calcium channel blockers[2]
Prognosis	Good[2]
Frequency	~10% of people[2]

Examine the table in this image and extract any merged cell regions. Please format the merged cell regions as JSON {'top-left':(x, y), 'bottom-right':(m, n)}, with (x, y) indicating the (row_id, column_id) of the top-left cell and (m, n) the bottom-right cell in the merged regions. Remember that the x, y, m, n all start from 1.

The merged cell region is: {'top-left':(1, 1), 'bottom-right':(1, 2)}.