Literature Review Synthesizer

Synthesize the sources below on the question: '{{research_question}}'.

Sources (with titles and key excerpts):
{{sources}}

Produce: a matrix with columns for source, method, sample/data, main finding, limitations; the 3–5 themes the sources agree on; where they contradict each other and plausible reasons; the strength of evidence for each theme (strong/moderate/weak, with justification); gaps nobody has answered; and a neutral 300-word synthesis paragraph. Cite only the sources provided; if a claim needs a source I did not give, mark it as unsupported. Never invent citations.