Table:
Cushing's syndrome
Other names	Hypercortisolism, Itsenko-Cushing syndrome, hyperadrenocorticism

Person's facial appearance 3 months after treatment with inhaled fluticasone[1]
Specialty	Endocrinology
Symptoms	High blood pressure, abdominal obesity with thin arms and legs, reddish stretch marks, round red face, fat lump between the shoulders, weak muscles, acne, fragile skin[2]
Usual onset	20–50 years[3]
Causes	Prolonged exposure to cortisol[3]
Diagnostic method	Requires a number of steps[4]
Treatment	Based on underlying cause[5]
Prognosis	Generally good with treatment[6]
Frequency	2–3 per million people per year[7]

Your task is as follows:
In this table image, locate all merged cells and detail their regions using the JSON {'top-left':(x, y), 'bottom-right':(z, w)}. Here, '(x, y)' and '(z, w)' denote the coordinates (row_id, column_id) of the top-left and bottom-right cells of the merged regions, respectively. Keep in mind that row and column IDs start from 1.

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