“…Regarding symptom severity, two of these studies (Money & Mittenthal, 1970;Nielsen et al, 1977) reported an average severity of depressive illness, while the remaining three were not able to comment on severity (Bender et al, 1995;Nielsen & Stradiot, 1987;Sabbath et al, 1961). The remaining nine articles (26% of the surveyed literature) are case reports or case series that relied only on expert opinion to make the determination of depression (Quality of Data Level 4), thus by design they do not have a control group or present data that are comparable to other populations (Christodorescu, Collino, Zellingher, & Tăutu, 1970;Dickens, 1970;Fishbain & Vilasuso, 1981;Larocca, 1985;Nielsen, 1970;Nielsen & Thomsen, 1968;Panzer & Tandon, 1991;Pitts & Guze, 1963;Shea & Wolfman, 2017). Table 2 summarizes the studies discussed above, categorized by method of depression evaluation and presence/ absence of control group.…”