EDITORIAL
Viera ŠTVRTINOVÁ, Marián BERNADIČ, Ján ŠTVRTINA: To be or not to be a teacher – or what is he message from Iohannes Amos Comenius?        

ORIGINAL PAPER
Ján MURÍN, Jozef BULAS, Martin WAWRUCH, Ľudovít GAŠPAR: Inflammation in heart failure        

CLINICAL STUDY
František SÁNDOR, Juraj PAYER, Milan KRIŠKA, Fedor ŠIMKO, Andrej DUKÁT: Growth differentiation factor 15 – a perspective biomarker in pneumology and invasive pneumology        
Vasyl P. PRYTULA, Oleh O. KURTASH: Long-term outcomes of mini-invasive methods of surgical treatment of Hirschprung‘s disease in children        
Oleksandr Dobrovanov, Karol Králinský: Complications of COVID-19 in children: PIMS-TS/MIS-C        
Mária SVITEKOVÁ, Martin KUŽMA, Juraj SMAHA, Peter VAŇUGA, Juraj PAYER: The influence of testosterone on the course and prognosis of COVID-19 disease        

Review
Daniela Dovalová, Andrej Mifkovič, Hisham EL FALOUGHY, Eliška Kubíková: Kidney carcinoma – etiology, diagnostics and treatment        

EDUCATION
Katarína GAZDÍKOVÁ, Katarína FURKOVÁ: Slovak Medika University in Bratislava is the leader of Resident Study