MedPeer, a member site for medical doctors asking what favourite manga/cartoon are.Top five is the following:
1 Black Jack by Osamu Tezuka ブラック・ジャック（手塚 治虫） 1,645 vote 54.1％
2 JIN by Motoka Murakami JIN-仁-（村上 もとか） 181 vote 6.0%
3 Say Hello to Black Jack by Shuho Sato ブラックジャックによろしく（佐藤 秀峰） 173 vote 5.7％
4 Team Medical Dragon by Taro Nogizaka and Akira Nagai 医龍（乃木坂 太郎 and 永井 明） 152 vote 5.0％
5 Super Doctor K by Kazuo Mafune スーパードクターK（真船 一雄） 131 vote 4.3％ ( this comic is influenced by Fist of the North Star, if you like Fist of the North Star, you may like this manga too)
My favourite Black Jack is the most popular comics also for medical practitioners in Japan. It got over 50% of the all voters. I have all comic books of BJ.
It seems many people were inspired to become doctors by the genius doctor, Kuro Hazama aka Black Jack.
But well, BJ has not medical licence, right?