Possible influences of vitamin D levels on sleep quality, depression, anxiety and physiological stress in patients with chronic obstructive pulmonary disease: a case control study by Carlos José Dias, Rodrigo Barroso, Carlos Alberto Alves Dias-Filho, Andressa Coelho Ferreira, Christian Emmanuel Torres Cabido, Carlos C Crestani, Mayra Santos Silva, Alcimar Nunes Pinheiro, Bruno Rodrigues, Cristiano Teixeira Mostarda

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