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1. Drug Addiction and Vitamin D Supplementation: How to Address a Health Concern in Methadone Treatment?

- Hosein Effatpanah

- Saeed Nateghi

2. Double COVID-19 Confirmed Case Fatality Rate in Countries with High Elderly Female Vitamin D Deficiency Prevalence

- Alex Bäcker

- Myron Mageswaran

3. The effect of vitamin D supplementation on tobacco-related disorders in individuals with a tobacco use disorder: a randomized clinical trial

- Soheil Bagheri

- Ahmad Reza Saghazade

- Samira Abbaszadeh-Mashkani

- Hamid Reza Banafshe

- Fatemeh Sadat Ghoreishi

- Azam Mesdaghinia

- Amir Ghaderi