Prognostic Significance of Serum Alkaline Phosphatase Level in Osteosarcoma: A Meta-Analysis of Published Data

Figure 6

Funnel plots assessing possible publication bias for prognosis ((a) OS; (b) EFS; (c) presence of metastasis at diagnosis; (d) metastasis development for nonmetastatic patients).

(a)

(b)

(c)

(d)