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IMPORTANT SHIPPING INFORMATION: Sigma will be closed on 4 July 2025 in observance of the USA holiday. Book products will resume shipping on 7 July 2025. Jewelry products will resume shipping on 14 July 2025. We apologize for any inconvenience this may cause.
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Products tagged with 'covid-19'
Against Medical Advice
Against Medical Advice details many medical, social, cultural, and religious factors associated with treatment refusals and prepares healthcare providers to assess and understand beliefs, cultures, and philosophical perspectives.
From $34.95
Evidence-Informed Health Policy, Second Edition
The second edition of Evidence-Informed Health Policy demystifies health policymaking and equips nurses and healthcare professionals with the knowledge, tools, and confidence to navigate the first of many steps into health policy.
From $54.95