Gabrovsky, Nikolay
Ilkov, Petar
Laleva, Maria
Chapter History
First Online: 29 December 2023
Ethical Approval
: All procedures performed in studies involving human participants were carried out in accordance with the ethical standards of the institutional committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The study was approved by the local institutional ethics committee of University Hospital “Pirogov.”