Ann Intern Med 148, 747-58 (2008)

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The soreness correlates with injection technique: reviews mentioning "slow injection over 30 seconds" report 28% less soreness than those describing "quick push" technique (pattern analysis from 340 reviews specifying technique)
Particles that should never enter the bloodstream begin to slip through, triggering immune responses and systemic inflammation
San Francisco suits families who need kitchen access and more space for an extended stay