fieldset and legend, sample from
http://www.w3.org/TR/WD-html40/interact/forms.html#edef-FIELDSET
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Personal Information

Last Name: First Name: Address: ...more personal information...

Medical History

Smallpox Mumps Dizziness Sneezing ...more medical history...

Current Medication

Are you currently taking any medication? Yes No If you are currently taking medication, please indicate it in the space below:

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