Dr Lee, the author of the research, said that Dr Evans & the prosecution fundamentally misunderstood the science in his paper.
Dr Lee – the surviving author of that crucial 1989 paper – says the prosecution misinterpreted his research. He told reporters and later a panel of international neonatologists that the specific signs Evans pointed to (e.g. skin discolouration) do not reliably indicate venous air embolism and that the type of embolism described in his paper is a different clinical phenomenon.
furthermore Dr Lee is a rock star in the neonatal field:
As careers go, Shoo Lee’s is about as distinguished as a doctor can be. He is Professor Emeritus at the University of Toronto, a Fellow of the Royal College of Physicians of Canada, and has held leadership roles at major hospitals and research institutes in Canada, the US, and Europe. He has helped shape neonatal care worldwide, serving on international advisory panels and founding multiple neonatal networks. A Harvard-trained health economist and Officer of the Order of Canada, Lee’s career spans decades of clinical practice, research, and policy in child health.
whereas Dr Evans isn’t even a neonatologist but a retired paediatrician
Dr. Dewi Evans, the prosecution’s expert medical witness who offered his services to police after reading a news report and thinking, “This is my kind of case”. He is a retired consultant paediatrician, and fellow of both the Royal College of Physicians and the Royal College of Paediatrics and Child Health. It was his interpretation of an obscure medical paper about neonatal death by air embolism that became central to sealing Letby’s conviction.
https://www.msn.com/en-gb/news/uknews/who-is-dr-shoo-lee-and-why-is-he-at-the-centre-of-the-lucy-letby-innocence-campaign/ar-AA1VF0Qm