Table:
Obsessive–compulsive disorder

Frequent, excessive hand washing occurs in some people with OCD
Specialty	Psychiatry
Symptoms	Feel the need to check things repeatedly, perform certain routines repeatedly, have certain thoughts repeatedly[1]
Complications	Tics, anxiety disorder, suicide[2][3]
Usual onset	Before 35 years[1][2]
Causes	Unknown[1]
Risk factors	Child abuse, stress[2]
Diagnostic method	Based on the symptoms[2]
Differential diagnosis	Anxiety disorder, major depressive disorder, eating disorders, obsessive–compulsive personality disorder[2]
Treatment	Counseling, selective serotonin reuptake inhibitors, tricyclic antidepressants[4][5]
Frequency	2.3%[6]

Could you analyze the table shown in the image and inform me about all the merged cell areas? Use the JSON {'top-left':(X1, Y1), 'bottom-right':(X2, Y2)} to represent each merged area, with (X1, Y1) as the (first row, first column) and (X2, Y2) as the (last row, last column). Note that the X1, Y1, X2, Y2 all start from 1.

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