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Timing of umbilical metastasis. Timing from date of diagnosis of the primary tumor to diagnosis of the umbilical metastasis, by origin of primary tumor (log2 scale). Primary tumor sites are only included if N ≥ 10 and if the primary tumor was known. The gray area marks the 6‐months interval (synchronous metastasis) [Color figure can be viewed at wileyonlinelibrary.com]
