Didn't check conflicts of interest closely but here are more sources: https://pubmed.ncbi.nlm.nih.gov/21701194/ https://pubmed.ncbi.nlm.nih.gov/21701194/ https:

Didn't check conflicts of interest closely but here are more sources: https://pubmed.ncbi.nlm.nih.gov/21701194/ https://pubmed.ncbi.nlm.nih.gov/21701194/ https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1600-0528.2004.00182.x https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1600-0528.... https://journals.sagepub.com/doi/abs/10.1177/00220345920710051801?journalCode=jdrb https://journals.sagepub.com/doi/abs/10.1177/002203459207100...