Edit the following text for grammar, clarity, logic, academic tone, and readability: Depression is a severe and concerning mental problem in lots of countries all the time. According to the estimation, more than 280 million population suffer from depression globally (World Health 2021), which increased the global burden of disease. More than 75% of patients, however, received no treatment in many low- and middle-income countries, so the prevention and intervention of depression should be paid more attention whether for personal health or social development (NAME_1-NAME_2 NAME_3 NAME_4. 2018). In practice, there exist various influencing factors and behavior of depression, and sleep is one of the hypothesized factors (Eleftheriou NAME_3 NAME_4. 2021, NAME_5 and NAME_6 2008, NAME_7 NAME_3 NAME_4. 2022).  Write your answer without using the letter z whatsoever in your entire response.
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