Low Vitamin D Levels Are Associated With Long COVID Syndrome in COVID-19 Survivors.

Context: Long COVID is an emerging syndrome affecting 50% to 70% of COVID-19 survivors that still lacks predicting factors.

Objective: Due to the extraskeletal effects of vitamin D, we retrospectively assessed the association between 25(OH) vitamin D levels and long COVID in COVID-19 survivors 6 months after hospitalization.

Methods: Long COVID was defined according to NICE guidelines.

Kidney function impairment in men with primary infertility: A case-control analysis.

Background: Infertile men have a worse overall health status than their fertile counterparts.

Objective: We aimed to (1) compare kidney function in men presenting for primary couple's infertility with that of fertile men and (2) assess kidney function impairment toward sperm quality in infertile men.

Materials And Methods: In this case-control study, 387 consecutive white-European infertile men were matched by age with 134 same-ethnicity fertile men.