In cross-sectional studies, drawing representative sampling at a lower cost and conducting long surveys are two big challenges. We provide the following services to overcome them.

• Write data collection and sampling protocol
• Set up reproducible documentation
• Write the high-frequency check and backcheck codes
• Digitize questionnaire into SurveyCTO platform
• Collect high-quality data and clean the data with reproducible codes
• Help researchers identify suitable funding and apply to those funding
• Engage relevant policymakers