Table 6. External validation comparison results.

Model	Accuracy (%)	Precision (%)	Recall (%)	F1-score (%)
ResNeXt-101	64.50	86.20	44.20	58.44
EfficientNet-B7	83.53	78.72	59.2	67.58
ResNet-101	73.50	100.00	53.10	69.37
DenseNet-121	80.10	77.20	67.20	71.90
Ours	95.32	94.57	96.17	95.37