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The influence of various size reduction methods on the PDI of niosomes with 40% Chol: (a) Tween 60 niosomes, (b) Span 60 niosomes and (c) Brij 72 niosomes and niosomes with 20% Chol: (d) Tween 60 niosomes, (e) Span 60 niosomes and (f) Brij 72 niosomes. *P < 0.05, **P < 0.01 and ***P < 0.001 (Mean ± SD, n = 3)
