@incollection{Almela20,
author = {Pilar Almela},
title = {Introductory Chapter: Opioid Analgesics - History, Uses and Risks},
booktitle = {Opioids},
publisher = {IntechOpen},
address = {Rijeka},
year = {2020},
editor = {Pilar Almela Rojo},
chapter = {1},
doi = {10.5772/intechopen.92401},
url = {https://doi.org/10.5772/intechopen.92401}
}