Sound motion pictures in obstetrics.

DeLee was one of the pioneers of filmmaking for the purpose of medical teaching. In this paper he described the necessary components of a medical film, including scripts, props, lighting, sound and expert staff members.

For a detailed account of DeLee's medical film productions see Caitjan Gainty, "A bit of Hollywood in the operating room," (2019) from medicineonscreen.nlm.nih.gov at this link. Here is an example of one of DeLee's films: