Are the reviews for the fat extraction injections at Gangnam The Slim Clinic good?

I'm reading reviews for fat extraction injections at Gangnam The Slim Clinic, and the effects seem to vary depending on the area treated.

I'm concerned about my upper arms and flanks; do they determine the dosage immediately during the consultation?

I've seen mentions of bruising and swelling in the reviews; is it possible to return to work right away?

I'm also curious to know how much pain those who have received a consultation at Gangnam The Slim Clinic experienced.