Medical Characters – Healthcare Whiteboard Animation by Doodle-Animation on CGguy
https://elements.envato.com/medical-characters-healthcare-whiteboard-animation-VSYMWD4
Free 
Hand Drawn Complete Pack by odeniz on CGguy
https://elements.envato.com/hand-drawn-complete-pack-VXLN7BF
Free 
Doodle Business Elements by PerryCox on CGguy
https://elements.envato.com/doodle-business-elements-V782VW5
Free 
Healhty Lifestyle – Sport, Fitness, Medicine Characters – Doodle Whiteboard Animation by Doodle-Animation on CGguy
https://elements.envato.com/healhty-lifestyle-sport-fitness-medicine-character-VWUGLM3
Free 
Whiteboard-Characters-Family-Whiteboard by Doodle-Animation on CGguy
https://elements.envato.com/whiteboard-characters-family-whiteboard-V86EFGM
Free