Understanding trace metals & breast implant illness symptoms...

Apparently some research into Breast Implant Illness is finding that this is due to trace metals. In one of my previous questions, one physician replied that trace metals were found in the CAPSULE that the body naturally forms around any implant. Another physician referenced that the trace metals were from silicone implants, so he had a safety preference for saline. Do any studies clearly specify where these trace metals in symptomatic patients are coming from? Thank you