Before revision:  Our goal is to identify primary studies and support the process of choosing and developing DL techniques applied to PCXR images , in addition to pointing out gaps and trends by drawing up a preliminary research agenda.
After revision:  Our goal is to identify primary studies and support the process of choosing and developing DL techniques applied in PCXR images. We elaborated on a Systematic Literature Mapping (SLM) protocol, including automatic search on six sources for studies published from January 1 , in addition to pointing out gaps and trends by drawing up a preliminary research agenda.