Arora, J GHanda, FSidhu, K S2009-05-282009-05-281981-05-01Arora JG, Handa F, Sidhu KS. Effect of oral contraceptives on urinary porphyrins. Indian Journal of Dermatology, Venereology and Leprology. 1981 May-Jun; 47(3): 142-5http://imsear.searo.who.int/handle/123456789/52291engBiologyContraceptionContraceptives, OralFamily Planning ServicesPhysiologyPorphyriasResearchSkinUrogenital SystemComparative Study