What type of coils should your dream mattress have?

Mattress coils impact the overall feel and support of your bed. Here's what you need to know about the five main types.
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Woman with coil contraceptive left stunned by what medics told her

Milja Maunuvaara, 28, had the copper coil - an intrauterine device (IUD) - fitted 18 months before she was told she was ...