Literature review for injecting dermal filler as an aesthetic injectable therapy. Using at least 2 types of research methodology

Your answer should include Key theories and concept, your assessment of the research questions, the type of research that was conducted, any ethical issues. A comprehensive list below is given for guidance. It is expected that you cite evidence from all embolden heading into your answer.
As well as the content of your critical review your tutor/assessor will be scrutinising the following aspects. Plagiarism and collusion. Critical writing, style, sentence structure, grammar, punctuation, argument, setting out. Rationale for choosing this research to review Presentation of research findings and conclusion. Referencing and Citation.
Guidance notes:
Key theories and concepts: How data has been previously studied/published (epistemological and methodological perspectives). Main issues researched to date and major debates of the topic. How have approaches to issues been addressed? Are the any gaps? What is the hypotheses? What is the null hypotheses? What are the actual outcomes?
Developing research questions: Identifying and research a problem; moving from problem to question; focusing the research question; from question to appropriate study design.
Quantitative study designs: Experimental and observational human participant designs, association causation; bias, confounding and chance. Appraising experimental and observational studies – Bias, critical appraisal, critical appraisal checklists, assessing risk of bias and risk of bias tools.
Qualitative study designs: Interviews, focus groups, and observations; positionality and reflexivity; credibility, transferability, dependability, trustworthiness. Appraising qualitative study designs; – Credibility, transferability, dependability, trustworthiness; Ethical issues in clinical and healthcare related research.
Ethical principles: gaining ethical approval and dealing with situational ethics, consent, ethical validation.

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